Merge branch 'unstable' of https://www.github.com/thinkallabout/argon into unstable
Removed GOAL.js
Moved maths to mathlib & created platform folder
Moved input files to own folder
Moved entity & sprite to entity folder
Moved src files up to root
Moved various files for better structure
Moved assets to game/ folder
Merge pull request #20 from thinkallabout/unstable

Unstable into Testing
Added CONTRIBUTING
Merge pull request #21 from thinkallabout/unstable

Moved assets to game/ folder & Added CONTRIBUTING
Merge pull request #22 from thinkallabout/testing

Testing into Master