Implemented drag and drop on dynamic bodies
Fixes on image names source directory and case sensitive
Debug draw CCPhysics is unified in CCDrawNode and is changed to enum

Merge branch 'master' of https://github.com/mono/CocosSharp

Conflicts:
	tests/tests/classes/tests/Physics/PhysicsTest.cs
Merge branch 'master' of https://github.com/mono/CocosSharp