Merge pull request #410 from bvssvni/master

Removed `AssetStore` from `Game::load`
Added conditional compilation

Closes https://github.com/PistonDevelopers/piston/issues/409
Merge pull request #414 from bvssvni/master

Upgraded to latest Rust-Empty
Merge pull request #415 from bvssvni/master

Added 'build.sh'
Early Cargo config file added
Updated authors field

Everyone that has committed to the Piston repo is listed as an author
in the format "github_name <github_email>".
Fixed docs in 'game.rs'
Merge pull request #416 from TyOverby/master

Early Cargo config file added.  Closes #413
Merge pull request #417 from Coeuvre/master

Fixed docs in 'game.rs'
Merge pull request #419 from bvssvni/master

Updated examples to latest Rust-Graphics
Upgraded to latest Rust-Empty