fixed detection for polygons on player
pulled out hitWall function, adjusted npc hit wall check
added object hit function
Player object collision test
multiplier for speed
Merge branch 'brian' of https://github.com/dllu/bieber-drive into brian
Added some health code
More stuff
Added some flash depleting user health
Merge branch 'brian', added new SVG sprites for simple player icon

Conflicts:
	css/bieberdrive.css
	index.html
	js/engine.js