Fixed Freedoom link in README.
Merge branch 'master' of github.com:cristicbz/rust-doom
Mini Readme improvement
Fixed path in README.
Removed dollar signs from shell input in README.
Added u8 vertex attributes
Added hardcoded animated flat names.
Added animated flats rendering.
Moved wall scrolling to vertex shader.
Removed random shuffle.
Added animation in wall shader & VBO.
Animated walls rendering.
Merge branch 'develop' of github.com:cristicbz/rust-doom into develop

Conflicts:
	src/shaders/flat.fragment.glsl
	src/shaders/flat.vertex.glsl
	src/shaders/wall.fragment.glsl
	src/shaders/wall.vertex.glsl
	src/wad/tex.rs
	src/wad/util.rs