updated project to scala 2.11, scala-js-dom 0.9.0, and sbt-scalajs 0.6.7

[cboddy]

Hi there,

Firstly thanks for a comprehensive and very helpful set of example games for scala-js, I found them most educational!

Since the old maven artefacts for the dependencies aren't available any more I've updated the project to the latest version of scalajs-dom etc.

Please let me know if you have any suggestions.

Thanks, Chris