see change log for 3.28.2013

- Refactored the way display objects are positioned.
- The display object receiving physics properties can now have its
registration point inn any location
- Added new clone method to the PhysicsProperties class to allow easy
replication
- You can now update the position of your display object by changing the
x and y properties of its correspondent PhysicsProperties class
- Extracted PhysicsProperties parsing from BodyFactory and added to a
new Definitions class
- Added new import com.reyco1.physinjector.manager.Utils class with some
handy methods for conversions and other stuff
- Added new DynamicRegistration class for the accurate positioning of
display objects based on the physics counterparts