Add minified box2d lib
Add rudimentary entity and physics management system
Add simple template for entity classes and a demo of circles
Add simple example of physics joints and rename box2d map file
Simplify physics shim, add entity template, and add Player class
Give player a physical torso and head
Give player some semblance of a body
Merge pull request #9 from UoBGamesDev/feat/physics

Feat/physics