Remove Generated Files

*Update .gitignore to remove generated files in .idea folder.

.gitignore

@@ -1,8 +1,40 @@
+# Built application files
+build/*
+*/app.iml
+
+# Crashlytics configuations
+com_crashlytics_export_strings.xml
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Gradle generated files
+.gradle/
+
+# Signing files
+.signing/
+
+# User-specific configurations
+.idea/*
+.idea/libraries/
+.idea/workspace.xml
+.idea/tasks.xml
+.idea/.name
+.idea/compiler.xml
+.idea/copyright/profiles_settings.xml
+.idea/encodings.xml
+.idea/misc.xml
+.idea/modules.xml
+.idea/scopes/scope_settings.xml
+.idea/vcs.xml
 *.iml
-.gradle
-/local.properties
-/.idea/workspace.xml
-/.idea/libraries
+captures/*
+
+# OS-specific files
 .DS_Store
-/build
-/captures
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db