Added concept of reference with BasicElements
Merge branch 'master' of github.com:anserran/eadventure
Merge branch 'master' of github.com:anserran/eadventure
Merge branch 'master' into scene2d

Conflicts:
	core/engine-core/src/main/java/ead/engine/core/gameobjects/effects/MoveSceneElementGO.java