Added support for screenshots for Android.

Added support for screenshots for Android.
Now uses ScreenShooter found at https://github.com/appium/screenshooter

Fixed some javascript lint issues

Removed screenshooter... again

Removed grunt buildScreenShooter and fixed string

Removed grunt build commands for Android Screen Shooter
Merge pull request #477 from mutualmobile/android_screenshot

Added support for screenshots for Android.
Merge remote-tracking branch 'upstream/master'