Merge branch 'development'
Support android studio 0.4.0
Version up to gradle 1.9

To solve "local path doesn't exist"
http://stackoverflow.com/questions/18256177/android-studio-local-path-doesnt-exist
Update travis to support gradle
Upgrade libraries
Change to android string
Reduce default strings
menu_setting_list_menu_delete to delete
Separate string resources
Simplify string names
Merge branch 'refactor_string' into development