Android Studio 1.0

Updating Android Studio to 1.0 stable and removing postflight task.

As I said on this Pull Request https://github.com/caskroom/homebrew-versions/pull/595 , Android Studio can be set to use JDK other than 6. The postflight task was causing trouble for Android Studio to auto update. So, it's better to users to change if needed and still have auto update working.
The `1629389` part will have to be changed in the future, when the app is updated, right? In that case, `#{version}` should not be used, since it grants us nothing.