Merge pull request #63 from bvssvni/master

Updated to latest piston-event
Merge pull request #64 from bvssvni/master

Upgraded to latest piston-event
Merge pull request #65 from bvssvni/master

Upgraded to latest piston-event
Merge pull request #66 from bvssvni/master

Upgraded to latest piston-event
Merge pull request #67 from bvssvni/master

Upgraded to latest piston-event
Merge pull request #68 from bvssvni/master

Upgraded to latest piston-event
Merge pull request #70 from bvssvni/master

Upgraded to latest piston-event
Merge pull request #71 from bvssvni/master

Swap event dependency with window
Merge pull request #72 from bvssvni/master

Upgraded to latest piston-window
Added link to how to contribute

See PistonDevelopers/piston#715
Updating for namespace changes in glfw
Upgraded to latest glfw-rs