Simplify gitignore

.gitignore

@@ -2,41 +2,7 @@
 #
 .DS_Store
 
-# Xcode
-#
-build/
-*.pbxuser
-!default.pbxuser
-*.mode1v3
-!default.mode1v3
-*.mode2v3
-!default.mode2v3
-*.perspectivev3
-!default.perspectivev3
-xcuserdata
-*.xccheckout
-*.moved-aside
-DerivedData
-*.hmap
-*.ipa
-*.xcuserstate
-project.xcworkspace
-
-# Android/IntelliJ
-#
-build/
-.idea
-.gradle
-local.properties
-*.iml
-
 # node.js
 #
 node_modules/
 npm-debug.log
-
-# BUCK
-buck-out/
-\.buckd/
-android/app/libs
-*.keystore