Revert "the mistake of calulating collision is cleared."

This reverts commit 738f94acab8de0f8f2ae498b00afa7510a385762.
Revert "touch event & realizing collision"

This reverts commit 00ce1c84ecaec37a87bc2c3ee20dfabef9baf4a4.

Conflicts:
	Classes/HelloWorldScene.cpp
	Classes/Planaria.cpp
	Classes/Planaria.h