Merge pull request #28 from bvssvni/master

Updated
Merge pull request #32 from bvssvni/master

Added rust-image
Merge pull request #34 from bvssvni/master

Added rust-sdl2_mixer as dependency
Merge pull request #41 from bvssvni/master

Added echoes to 'upgrade.sh'
Merge pull request #42 from bvssvni/master

Upgraded gl-rs
Merge pull request #44 from bvssvni/master

Updated glfw-rs
Merge pull request #45 from bvssvni/master

Updated hgl-rs
Merge pull request #46 from bvssvni/master

Updated rust-sdl2
Merge pull request #47 from bvssvni/master

Upgraded
Added installing library instructions

Closes https://github.com/PistonDevelopers/piston-workspace/issues/37
Closes https://github.com/PistonDevelopers/piston-workspace/issues/36
Closes https://github.com/PistonDevelopers/piston-workspace/issues/35
Changed to GLFW 3.x

Closes https://github.com/PistonDevelopers/piston-workspace/issues/50
Removed Rust-png

Changed Domain to piston.rs
Merge pull request #51 from leonkunert/master

Removed Rust-png
Updated