Merge pull request #15 from bvssvni/master

Fixed missing docs warning
Merge pull request #17 from bvssvni/master

Reexported `gfx_texture::Texture`
Made the library work with rust nightly

Collections were changed, primarily find_equiv which caused the failure.
Merge pull request #18 from mitsuhiko/master

Made the library work with rust nightly
Upgraded