Add Nonplayer class and instantiation.
Added NPC
Change collision logic to take into account NPC class.
Change collision logic
Change Nonplayer sprite logic
Add to-do item
Add secondary collision check for NPC interaction
Update NPC collision, logic, and generation.
Simplify collision logic and win variables.
Remove comented code
Randomize bug respawn rows
Merge branch 'gh-pages' of https://github.com/aricept/frontend-nanodegree-arcade-game into gh-pages

Conflicts:
	js/app.js