iPhone 6 & 6 Plus support + bug fixes

Added: new physics properties (damping, velocity)
Added: iPhone 6 & 6 Plus support
Added: Tile-able textures for shapes

Bug fix: A crash caused on device when changing scenes caused by Box2d body removal.
Bug fix: A crash when changing scenes using transitions
Bug fix: Joints anchor location when one or both connected sprites were scaled
Bug fix: Revolute joint, prismatic joint and wheel joint motor speed + limits
Bug fix: A collision handling issue.
Bug fix: Animation repetitions were playing 1 extra time
Bug fix: Parallax initial position when parallax was following a camera