levelScreen v1 + entities except Animation v2
Merge blem solved
plein de modifs : transition load -> choice
levelScreen ref chagned into game.currentScreen
Merge branch 'master' of https://github.com/Warrows/projet-intensif-image-2015

Conflicts:
	ChoiceScreen.js
Merge branch 'master' of https://github.com/obodrel/projet-intensif-image-2015
Commentaire code non ecrit levelscreen