PistonDevelopers/piston — pull request #423 by bvssvni (2014-06-26 00:49:15+00:00)
Title: Removed SDL2 and GLFW back-ends

Those are moved to

https://github.com/PistonDevelopers/glfw_game_window

https://github.com/PistonDevelopers/sdl2_game_window