fix #20, make setXXXPriority works even if node is running
(cherry picked from commit 2132dfc8bc1da4f84b834abdd8f3084228df140f)

Conflicts:

	jni/WiEngine/include/events/wyEventDispatcher.h
	jni/WiEngine/include/nodes/wyNode.h
(cherry picked from commit 8185915d37c0a91ca8e83e92f8d327a7db95f6f1)