Implement SDL_UpperBlit as upper_blit
Merge branch 'master' of https://github.com/AngryLawyer/rust-sdl2
Make upper_blit use transmute instead of match
Merge branch 'master' of https://github.com/AngryLawyer/rust-sdl2
Change from upper_blit to blit_surface
Change blit_surface to blit