Added NoGameWindow, for those who want to run a windowless gameloop
Added concept of closing to NoGameWindow
Reexport NoGameWindow
Merge pull request #619 from AngryLawyer/master

Implement NoGameWindow
Updated links in README

* Replaced “Partner project” with “Back-ends”
* Fixed link to online docs
* Replaced “Tutorial” with “Examples”
Merge pull request #621 from bvssvni/master

Updated links in README
Merge pull request #623 from mkcp/master

remove files keyboard.rs and mouse.rs; now living in lib piston-input
Added sample count to window settings
Merge pull request #626 from kvark/msaa

Added sample count to window settings
Renamed stuff

Closes https://github.com/PistonDevelopers/piston/issues/625
Merge pull request #627 from bvssvni/master

Renamed stuff