Chipmunk gem loaded for local development
Initial integration of TMX
FIX specific name for the Bounds
Merge branch 'true-tmx-support' into chipmunk

Conflicts:
	lib/metro.rb
Updated TileMaps

* Tile Maps can find the objects in the object layer that match the type
* Layers in the tile map automatically add a bit of slop to ensure
  they paint correctly when being rendered in the viewport
* Tile Map Objects can now create their own bodies and shapes
* RectangleBounds can enlarge in size by some parameters
Updated TileSet and Objects are now more intelligent

* Fixes, tests, and refactors for the TileSet class.
* Image cropping is now taken care of by Metro::Image which
  addresses a corrupted scren issue when reloading Metro. Hurray!
* Object class now knows how to make itself a Chipmunk Body and Shape
Merge branch 'master' into chipmunk
Tile Map now follows a particular target specified during creation
Refactored the TileMap and TileSet to have cleaner implementation
Merge branch 'chipmunk'