Update to Rust nightly, namespaced enums, use rustrt crate
Temporarily use sdl2::audio::ll instead of deprecated SDL audio bindings
Fixed importing enums and attempt to compile with nightly rust ~0.13.ish.
Merge remote-tracking branch 'nukep/master'

Conflicts:
	gfx.rs
	input.rs
	main.rs
	mapper.rs
	nes.rs
	ppu.rs