Merge pull request #2644 from Terik23/ignore_idea_caches

Add the idea caches to gitignore

Android.gitignore

@@ -39,6 +39,7 @@ captures/
 .idea/gradle.xml
 .idea/dictionaries
 .idea/libraries
+.idea/caches
 
 # Keystore files
 # Uncomment the following line if you do not want to check your keystore files in.