Added GameObject class, beginnings of physics code

- can now fly around, using left/right to turn and up/down to accel/brake
Added Ship class, added specs to GameObject

- Ship will obviously handle ships, while GameObject is a parent class for all on screen objects
- GameObject.specs will hold 'prototype' information - ie: max speed, turn rate, hp, etc
Can now fire weapons!

- Still need to define an actual Projectile class
Merge branch 'master' into gh-pages

also built