extended try-catch to catch an Unexpected NullPointerException
added gradle adb tasks for apk installs and test runs
Merge pull request #1034 from Catrobat/cat-931

[CAT-931] extended try-catch
move tasks to subfolder; rename some tasks
fix possible runtime exception
Merge pull request #1039 from Catrobat/catchPossibleRuntimeException

catch possible runtime exception
Merge pull request #1035 from Catrobat/adbTasks

added gradle adb tasks for apk installs and test runs
fix fatal exception
Merge pull request #1040 from Catrobat/fixFatalException

fix fatal exception
fixed issue cat-780

fixed behaviour except android-back-button

adapted tests
changed implementation to not use the Constructor