Added conf.lua

conf.lua is Love2D's default configuration file.
Removed unnecessary configuration lines from main.lua
Updated to Love2D 0.9.0

The only compatibility problems we had were:
1. Using love.graphics.setCaption to set the screen caption (fixed w/
conf.lua)
2. Using love.graphics.(get|set)ColorMode (removed with this update)
So really, we're all good here.