Update to 0.0.3

• Added unit tests for Flaxen, ActionQueue and Tween.
• Wrote user guide
• Generated API documentation
• Merged demos into single app utilizing handlers, added MotionHandler demo
• Numerous core engine (Flaxen.hx) improvements and changes
• Added EntityRef as parameter to allow lookups by entity name or entity instance
• Redesigned and cleaner easing functions
• Relocated some files, so package paths have also changed
• Rewrote tweening to support new easing functions and add some features
• Added new components such as Immutable
• Privatized nodes wherever possible to clean up code base
• Reworked completion handling
• Added new basic systems for gravity, friction, and death boxes.
• Fixed issues with BitmapText
• Many other bug fixes
• Waited too long to push out new release: check!