Transformations, lhplist extension, delegates

Levels are now published wih lhplist extension. Updated all demos because of that.
Fixed physics transformations issues when dealing with children. (Chipmunk does not work - bug in Cocos2d)
Added Collision Handling delegate.
Added Animation Handling delegate.
Added a new demo
Fixed issue loading traced shapes when using assets
Fixed issue when using joints inside assets (only revolute joint at the moment)
Fixed joints when loaded from assets.
Fixed an issue with collision handling not called with sensors
Fixed an issue with collision handling not getting called when colliding the the physics boundaries.
Handle unsaved assets, removed a log
updated documentation comments
Fixed an animation issue.
Updated character animation demo.
Set all values to 0 when activating an animation
Added MAC OS Target

Added MAC OS Target
Updated all demos to support Mac OS
cleaned code
Merge pull request #5 from vladubogdan/develop

Transformations, delegates, Mac OS Target, new demo, sensor collision