Fix for collision using the inversion of the masks. This fixes the problem by inverting the Y coordinate of the collision test.
Fix for Issue #385.
Merge pull request #386 from Cocos2DXNA/ISSUE_385

Fix for Issue #385.
Merge pull request #387 from Cocos2DXNA/master

1.3.1 Hotfix for collisions and stencil buffer