uppercase letters for english drone bricks
extended try-catch to catch an Unexpected NullPointerException
added gradle adb tasks for apk installs and test runs
move tasks to subfolder; rename some tasks
fix possible runtime exception
fix fatal exception
fixed issue cat-780

fixed behaviour except android-back-button

adapted tests
changed implementation to not use the Constructor

Update MainMenuActivityTest.java
Implemented FaceDetection and Camera support
Fixed FaceDetection
compatibility LEDBrick(Singleton Camera)

compatibility of Led Brick (Singleton Camera)
Merge branch 'facedetection-new-t' of http://github.com/Catrobat/Catroid into facedetection-new-t
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