Implement Renderer::read_pixels, Texture::lock, Texture::unlock.#77

Merged

AngryLawyer merged 3 commits intoRust-SDL2:masterfrom

andelf:refactor-texture-and-pixelformat

Apr 16, 2014

Commits on Apr 13, 2014

add SDL_version APIs
andelf
committed

Commits on Apr 14, 2014

render.rs: change bool return type to Result
andelf
committed

Commits on Apr 15, 2014

add Renderer::read_pixels, Texture::lock, Texture::unlock.
andelf
committed