diff --git a/.idea/codeStyleSettings.xml b/.idea/codeStyleSettings.xml
index 38ef164f..eee0ba6d 100644
--- a/.idea/codeStyleSettings.xml
+++ b/.idea/codeStyleSettings.xml
@@ -62,125 +62,153 @@
           </indentOptions>
           <arrangement>
             <rules>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>xmlns:android</NAME>
-                    <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
-                  </AND>
-                </match>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>xmlns:.*</NAME>
-                    <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
-                  </AND>
-                </match>
-                <order>BY_NAME</order>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*:id</NAME>
-                    <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                  </AND>
-                </match>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*:name</NAME>
-                    <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                  </AND>
-                </match>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>name</NAME>
-                    <XML_NAMESPACE>^$</XML_NAMESPACE>
-                  </AND>
-                </match>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>style</NAME>
-                    <XML_NAMESPACE>^$</XML_NAMESPACE>
-                  </AND>
-                </match>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*</NAME>
-                    <XML_NAMESPACE>^$</XML_NAMESPACE>
-                  </AND>
-                </match>
-                <order>BY_NAME</order>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*:layout_width</NAME>
-                    <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                  </AND>
-                </match>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*:layout_height</NAME>
-                    <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                  </AND>
-                </match>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*:layout_.*</NAME>
-                    <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                  </AND>
-                </match>
-                <order>BY_NAME</order>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*:width</NAME>
-                    <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                  </AND>
-                </match>
-                <order>BY_NAME</order>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*:height</NAME>
-                    <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                  </AND>
-                </match>
-                <order>BY_NAME</order>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*</NAME>
-                    <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
-                  </AND>
-                </match>
-                <order>BY_NAME</order>
-              </rule>
-              <rule>
-                <match>
-                  <AND>
-                    <NAME>.*</NAME>
-                    <XML_NAMESPACE>.*</XML_NAMESPACE>
-                  </AND>
-                </match>
-                <order>BY_NAME</order>
-              </rule>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>xmlns:android</NAME>
+                      <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>xmlns:.*</NAME>
+                      <XML_NAMESPACE>Namespace:</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                  <order>BY_NAME</order>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*:id</NAME>
+                      <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*:name</NAME>
+                      <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>name</NAME>
+                      <XML_NAMESPACE>^$</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>style</NAME>
+                      <XML_NAMESPACE>^$</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*</NAME>
+                      <XML_NAMESPACE>^$</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                  <order>BY_NAME</order>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*:layout_width</NAME>
+                      <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*:layout_height</NAME>
+                      <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*:layout_.*</NAME>
+                      <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                  <order>BY_NAME</order>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*:width</NAME>
+                      <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                  <order>BY_NAME</order>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*:height</NAME>
+                      <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                  <order>BY_NAME</order>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*</NAME>
+                      <XML_NAMESPACE>http://schemas.android.com/apk/res/android</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                  <order>BY_NAME</order>
+                </rule>
+              </section>
+              <section>
+                <rule>
+                  <match>
+                    <AND>
+                      <NAME>.*</NAME>
+                      <XML_NAMESPACE>.*</XML_NAMESPACE>
+                    </AND>
+                  </match>
+                  <order>BY_NAME</order>
+                </rule>
+              </section>
             </rules>
           </arrangement>
         </codeStyleSettings>
@@ -188,5 +216,4 @@
     </option>
     <option name="USE_PER_PROJECT_SETTINGS" value="true" />
   </component>
-</project>
-
+</project>
\ No newline at end of file
diff --git a/.idea/gradle.xml b/.idea/gradle.xml
index 0d7d4561..afa3dedb 100644
--- a/.idea/gradle.xml
+++ b/.idea/gradle.xml
@@ -7,6 +7,7 @@
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="gradleHome" value="/opt/gradle" />
+        <option name="gradleJvm" value="1.7" />
         <option name="modules">
           <set>
             <option value="$PROJECT_DIR$" />
@@ -18,5 +19,4 @@
       </GradleProjectSettings>
     </option>
   </component>
-</project>
-
+</project>
\ No newline at end of file
diff --git a/.idea/misc.xml b/.idea/misc.xml
index 92954b82..f1a41e1f 100644
--- a/.idea/misc.xml
+++ b/.idea/misc.xml
@@ -1,8 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="DaemonCodeAnalyzer">
-    <disable_hints />
-  </component>
   <component name="EntryPointsManager">
     <entry_points version="2.0" />
   </component>
@@ -43,104 +40,6 @@
   <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" assert-keyword="true" jdk-15="true" project-jdk-name="1.7" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
-  <component name="RunManager">
-    <configuration default="true" type="#org.jetbrains.idea.devkit.run.PluginConfigurationType" factoryName="Plugin">
-      <module name="" />
-      <option name="VM_PARAMETERS" value="-Xmx512m -Xms256m -XX:MaxPermSize=250m -ea" />
-      <option name="PROGRAM_PARAMETERS" />
-      <method />
-    </configuration>
-    <configuration default="true" type="Remote" factoryName="Remote">
-      <option name="USE_SOCKET_TRANSPORT" value="true" />
-      <option name="SERVER_MODE" value="false" />
-      <option name="SHMEM_ADDRESS" value="javadebug" />
-      <option name="HOST" value="localhost" />
-      <option name="PORT" value="5005" />
-      <method />
-    </configuration>
-    <configuration default="true" type="Applet" factoryName="Applet">
-      <module name="" />
-      <option name="MAIN_CLASS_NAME" />
-      <option name="HTML_FILE_NAME" />
-      <option name="HTML_USED" value="false" />
-      <option name="WIDTH" value="400" />
-      <option name="HEIGHT" value="300" />
-      <option name="POLICY_FILE" value="$APPLICATION_HOME_DIR$/bin/appletviewer.policy" />
-      <option name="VM_PARAMETERS" />
-      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-      <option name="ALTERNATIVE_JRE_PATH" />
-      <method />
-    </configuration>
-    <configuration default="true" type="TestNG" factoryName="TestNG">
-      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
-      <module name="" />
-      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-      <option name="ALTERNATIVE_JRE_PATH" />
-      <option name="SUITE_NAME" />
-      <option name="PACKAGE_NAME" />
-      <option name="MAIN_CLASS_NAME" />
-      <option name="METHOD_NAME" />
-      <option name="GROUP_NAME" />
-      <option name="TEST_OBJECT" value="CLASS" />
-      <option name="VM_PARAMETERS" value="-ea" />
-      <option name="PARAMETERS" />
-      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
-      <option name="OUTPUT_DIRECTORY" />
-      <option name="ANNOTATION_TYPE" />
-      <option name="ENV_VARIABLES" />
-      <option name="PASS_PARENT_ENVS" value="true" />
-      <option name="TEST_SEARCH_SCOPE">
-        <value defaultName="moduleWithDependencies" />
-      </option>
-      <option name="USE_DEFAULT_REPORTERS" value="false" />
-      <option name="PROPERTIES_FILE" />
-      <envs />
-      <properties />
-      <listeners />
-      <method />
-    </configuration>
-    <configuration default="true" type="Application" factoryName="Application">
-      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
-      <option name="MAIN_CLASS_NAME" />
-      <option name="VM_PARAMETERS" />
-      <option name="PROGRAM_PARAMETERS" />
-      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
-      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-      <option name="ALTERNATIVE_JRE_PATH" />
-      <option name="ENABLE_SWING_INSPECTOR" value="false" />
-      <option name="ENV_VARIABLES" />
-      <option name="PASS_PARENT_ENVS" value="true" />
-      <module name="" />
-      <envs />
-      <method />
-    </configuration>
-    <configuration default="true" type="JUnit" factoryName="JUnit">
-      <extension name="coverage" enabled="false" merge="false" sample_coverage="true" runner="idea" />
-      <module name="" />
-      <option name="ALTERNATIVE_JRE_PATH_ENABLED" value="false" />
-      <option name="ALTERNATIVE_JRE_PATH" />
-      <option name="PACKAGE_NAME" />
-      <option name="MAIN_CLASS_NAME" />
-      <option name="METHOD_NAME" />
-      <option name="TEST_OBJECT" value="class" />
-      <option name="VM_PARAMETERS" value="-ea" />
-      <option name="PARAMETERS" />
-      <option name="WORKING_DIRECTORY" value="$PROJECT_DIR$" />
-      <option name="ENV_VARIABLES" />
-      <option name="PASS_PARENT_ENVS" value="true" />
-      <option name="TEST_SEARCH_SCOPE">
-        <value defaultName="moduleWithDependencies" />
-      </option>
-      <envs />
-      <patterns />
-      <method />
-    </configuration>
-    <list size="0" />
-    <configuration name="&lt;template&gt;" type="WebApp" default="true" selected="false">
-      <Host>localhost</Host>
-      <Port>5050</Port>
-    </configuration>
-  </component>
   <component name="masterDetails">
     <states>
       <state key="ProjectJDKs.UI">
@@ -157,5 +56,4 @@
       </state>
     </states>
   </component>
-</project>
-
+</project>
\ No newline at end of file
diff --git a/.idea/runConfigurations/Run.xml b/.idea/runConfigurations/Run.xml
index d2a72f56..86690768 100644
--- a/.idea/runConfigurations/Run.xml
+++ b/.idea/runConfigurations/Run.xml
@@ -17,6 +17,10 @@
     <option name="CLEAR_LOGCAT" value="false" />
     <option name="SHOW_LOGCAT_AUTOMATICALLY" value="true" />
     <option name="FILTER_LOGCAT_AUTOMATICALLY" value="true" />
+    <option name="SELECTED_MATRIX_CONFIGURATION_ID" value="0" />
+    <option name="SELECTED_CLOUD_PROJECT_ID" value="" />
+    <option name="IS_VALID_CLOUD_SELECTION" value="false" />
+    <option name="INVALID_CLOUD_SELECTION_ERROR" value="" />
     <RunnerSettings RunnerId="AndroidDebugRunner" />
     <ConfigurationWrapper RunnerId="AndroidDebugRunner" />
     <method />
diff --git a/android-app-tests/android-app-tests.iml b/android-app-tests/android-app-tests.iml
index c339e42e..16d6d5d4 100644
--- a/android-app-tests/android-app-tests.iml
+++ b/android-app-tests/android-app-tests.iml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="calculatorpp" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
+<module external.linked.project.id=":android-app-tests" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="calculatorpp" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
   <component name="FacetManager">
     <facet type="android-gradle" name="Android-Gradle">
       <configuration>
@@ -8,7 +8,8 @@
     </facet>
     <facet type="java-gradle" name="Java-Gradle">
       <configuration>
-        <option name="BUILD_FOLDER_PATH" />
+        <option name="BUILD_FOLDER_PATH" value="$MODULE_DIR$/build" />
+        <option name="BUILDABLE" value="true" />
       </configuration>
     </facet>
   </component>
@@ -73,39 +74,39 @@
     <orderEntry type="library" exported="" scope="TEST" name="xercesMinimal-1.9.6.2" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="nekohtml-1.9.6.2" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="support-annotations-21.0.3" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="jscl-1.0.11" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="simple-xml-2.6.1" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="core" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="commons-cli-1.2" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="annotations-2.0.1" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="core" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="internal_impl-21.0.3" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="stax-1.2.0" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="common-msg-1.0.5" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="support-annotations-21.0.3" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="common-msg-1.0.5" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="common-listeners-1.0.7" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="guava-11.0.2" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="library-2.4.0" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="common-text-1.0.7" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="library-2.4.0" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="acra-4.5.0" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="internal_impl-21.0.3" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="common-core-1.0.7" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="common-security-1.0.7" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="classes" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="_home_serso_projects_java_android_calculatorpp_android_app_build_intermediates_classes_debug" level="project" />
-    <orderEntry type="library" exported="" scope="TEST" name="_home_serso_projects_java_android_calculatorpp_android_app_build_intermediates_dependency_cache_debug" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="jscl-1.0.11" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="_home_serso_projects_java_serso_android_calculatorpp_android_app_build_intermediates_classes_debug" level="project" />
+    <orderEntry type="library" exported="" scope="TEST" name="_home_serso_projects_java_serso_android_calculatorpp_android_app_build_intermediates_dependency_cache_debug" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="android" level="project" />
+    <orderEntry type="library" exported="" name="android-app-tests.android-app-tests" level="project" />
   </component>
-</module>
-
+</module>
\ No newline at end of file
diff --git a/android-app/android-app.iml b/android-app/android-app.iml
index 7f37c031..70eb22f9 100644
--- a/android-app/android-app.iml
+++ b/android-app/android-app.iml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="org.solovyev.android" external.system.module.version="2.1.3" type="JAVA_MODULE" version="4">
+<module external.linked.project.id=":android-app" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="org.solovyev.android" external.system.module.version="2.1.3" type="JAVA_MODULE" version="4">
   <component name="FacetManager">
     <facet type="android-gradle" name="Android-Gradle">
       <configuration>
@@ -12,8 +12,9 @@
         <option name="SELECTED_TEST_ARTIFACT" value="_android_test_" />
         <option name="ASSEMBLE_TASK_NAME" value="assembleDebug" />
         <option name="COMPILE_JAVA_TASK_NAME" value="compileDebugSources" />
-        <option name="ASSEMBLE_TEST_TASK_NAME" value="assembleDebugTest" />
         <option name="SOURCE_GEN_TASK_NAME" value="generateDebugSources" />
+        <option name="ASSEMBLE_TEST_TASK_NAME" value="assembleDebugTest" />
+        <option name="COMPILE_JAVA_TEST_TASK_NAME" value="compileDebugTestSources" />
         <option name="TEST_SOURCE_GEN_TASK_NAME" value="generateDebugTestSources" />
         <option name="ALLOW_USER_CONFIGURATION" value="false" />
         <option name="MANIFEST_FILE_RELATIVE_PATH" value="/src/main/AndroidManifest.xml" />
@@ -117,5 +118,4 @@
     <orderEntry type="library" exported="" name="simple-xml-2.6.1" level="project" />
     <orderEntry type="module" module-name="core" exported="" />
   </component>
-</module>
-
+</module>
\ No newline at end of file
diff --git a/calculatorpp.iml b/calculatorpp.iml
index 0bb6048a..1f90f96a 100644
--- a/calculatorpp.iml
+++ b/calculatorpp.iml
@@ -1,9 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
+<module external.linked.project.id="calculatorpp" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$" external.system.id="GRADLE" external.system.module.group="" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
   <component name="FacetManager">
     <facet type="java-gradle" name="Java-Gradle">
       <configuration>
         <option name="BUILD_FOLDER_PATH" value="$MODULE_DIR$/build" />
+        <option name="BUILDABLE" value="false" />
       </configuration>
     </facet>
   </component>
@@ -15,5 +16,4 @@
     <orderEntry type="inheritedJdk" />
     <orderEntry type="sourceFolder" forTests="false" />
   </component>
-</module>
-
+</module>
\ No newline at end of file
diff --git a/core/core.iml b/core/core.iml
index ac0bd202..9472019c 100644
--- a/core/core.iml
+++ b/core/core.iml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<module external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="calculatorpp" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
+<module external.linked.project.id=":core" external.linked.project.path="$MODULE_DIR$" external.root.project.path="$MODULE_DIR$/.." external.system.id="GRADLE" external.system.module.group="calculatorpp" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
   <component name="FacetManager">
     <facet type="android-gradle" name="Android-Gradle">
       <configuration>
@@ -8,7 +8,8 @@
     </facet>
     <facet type="java-gradle" name="Java-Gradle">
       <configuration>
-        <option name="BUILD_FOLDER_PATH" />
+        <option name="BUILD_FOLDER_PATH" value="$MODULE_DIR$/build" />
+        <option name="BUILDABLE" value="true" />
       </configuration>
     </facet>
   </component>
@@ -41,6 +42,6 @@
     <orderEntry type="library" exported="" scope="TEST" name="mockito-core-1.9.0" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="hamcrest-core-1.3" level="project" />
     <orderEntry type="library" exported="" scope="TEST" name="objenesis-1.0" level="project" />
+    <orderEntry type="library" exported="" name="core.core" level="project" />
   </component>
-</module>
-
+</module>
\ No newline at end of file