add eclipse pref for import order

- should be the same as in Android Studio
- rename packages to lowercase
move ProjectData to own File
Merge pull request #598 from Catrobat/issue#596

add eclipse pref for import order
refactor junitTest cleanup

when executing all junit tests, some tests did not cleanup
the test projects - they were left in Pocketcode folder.
a helper method is called in teardown() to delete these
projects after the testcase
Merge pull request #593 from Catrobat/cleanupJunitTests

refactor junitTest cleanup
Merge branch 'master' into SOR-facedetection

Conflicts:
	catroid/src/org/catrobat/catroid/stage/PreStageActivity.java
	catroid/src/org/catrobat/catroid/stage/StageListener.java
	catroid/src/org/catrobat/catroid/ui/ProjectActivity.java
	catroid/src/org/catrobat/catroid/ui/dialogs/FormulaEditorComputeDialog.java
	catroidTest/src/org/catrobat/catroid/test/formulaeditor/SensorTest.java
split camera and face detection
issue SOR-5 introduced VideoDisplayHandler
issue SOR-5 introduced videoLook (not functional yet)
issue SOR-5 added VideoLook with VideoLookData