added a default ctor to make the transitions work with the popScene(with transition).
Merge branch 'master' of https://github.com/totallyevil/cocos2d-xna

Conflicts:
	cocos2d/layers_scenes_transitions_nodes/transition/CCTransitionFlipAngular.cs
	cocos2d/layers_scenes_transitions_nodes/transition/CCTransitionFlipX.cs
	cocos2d/layers_scenes_transitions_nodes/transition/CCTransitionZoomFlipY.cs