ignore .idea in .gitignore / remove .idea from index

executed
git rm -r --cached .idea
according to
https://stackoverflow.com/questions/1274057/how-to-make-git-forget-about-a-file-that-was-tracked-but-is-now-in-gitignore

Signed-off-by: Marcel Hibbe <dev@mhibbe.de>

.gitignore

@@ -2,7 +2,7 @@
 *.apk
 *.ap_
 
-# Files for the ART/Dalvik VM
+# Files for the ART/ Dalvik VM
 *.dex
 
 # Java class files
@@ -15,6 +15,7 @@ out/
 
 # Local configuration file (sdk path, etc)
 local.properties
+tests/local.properties
 
 # Proguard folder generated by Eclipse
 proguard/
@@ -22,19 +23,14 @@ proguard/
 # Log Files
 *.log
 
-# Android Studio Navigation editor temp files
-.navigation/
-
-# Android Studio captures folder
-captures/
-
-# Intellij
+# Android Studio and Gradle specific entries
 *.iml
-.idea/workspace.xml
-.idea/tasks.xml
-.idea/gradle.xml
-.idea/dictionaries
-.idea/libraries
+.gradle
+.idea
+build
+/gradle.properties
+captures/
+.navigation/
 
 # Keystore files
 *.jks
@@ -52,9 +48,4 @@ freeline/
 freeline_project_description.json
 .DS_Store
 
-# Android Studio and Gradle specific entries
-.gradle/
-build/
-.idea/
-/gradle.properties
-/app/gplay/release/output.json
+

.idea/misc.xml

@@ -1,9 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
-    <output url="file://$PROJECT_DIR$/build/classes" />
-  </component>
-  <component name="ProjectType">
-    <option name="id" value="Android" />
-  </component>
-</project>

.idea/runConfigurations.xml

@@ -1,12 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="RunConfigurationProducerService">
-    <option name="ignoredProducers">
-      <set>
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.AllInPackageGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestClassGradleConfigurationProducer" />
-        <option value="org.jetbrains.plugins.gradle.execution.test.runner.TestMethodGradleConfigurationProducer" />
-      </set>
-    </option>
-  </component>
-</project>

.idea/vcs.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project version="4">
-  <component name="VcsDirectoryMappings">
-    <mapping directory="" vcs="Git" />
-  </component>
-</project>