Merge pull request #1 from bvssvni/master

Moved in cube.rs and array.rs from Hematite
Merge pull request #2 from bvssvni/master

Fixed package name
Merge pull request #9 from bvssvni/master

Moved in texture.rs from Hematite
Merge pull request #10 from bvssvni/master

Added comment about checking whether it is loaded
Merge pull request #11 from bvssvni/master

Use `rect: [u32, ..4]` in min_alpha
Added dependency graph to README

Closes https://github.com/PistonDevelopers/gfx_voxel/issues/12