Merge pull request #11 from vladubogdan/develop

Added nodes subclassing support + demo
Updated libraries version
Bug fixes

Fixes issue #12
https://github.com/vladubogdan/LevelHelper2-Cocos2d-v3/issues/12
Fixed a leak caused by debug drawing
When using camera/parallax there is no more snap to location when loading a scene.
iPhone 6,6+ support + bug fixes