Merge pull request #288 from bvssvni/master

Made event loop fully generic
Merge pull request #290 from bvssvni/master

Moved event loop to its own repo
Merge pull request #291 from bvssvni/master

Reexport from piston-window
Update README.md
Added link to how to contribute

See PistonDevelopers/piston#715
Upgraded to latest Rust

Closes https://github.com/PistonDevelopers/event/issues/292