bugfix: error when disposing imagerenderer (2)
bugfix: invalidatehierarchy in paste
bugfix when deleting actor from scene
Merge branch 'master' of https://github.com/bladecoder/bladecoder-adventure-engine

Conflicts:
	blade-engine/src/org/bladecoder/engine/model/ImageRenderer.java
	blade-engine/src/org/bladecoder/engine/model/World.java