refactor hangup and resume of physics object
Refactoring

Add PhysicWorld.activeArea
Rename PhysicObject-Stuff
Write HangUpTest
Fix some Action Tests

Conflicts:
	catroid/src/org/catrobat/catroid/physics/PhysicsWorld.java
Merge pull request #1086 from Catrobat/physics_CAT-1101_addGlideToPhysicsActionTest

Physics cat 1101 add glide to physics action test
add minor physics brick changes for CAT-1112, CAT-1113 and CAT-1115
reorder physics bricks in category
rename collision with brick
fix bug in gravity and velocity brick