Upgrade to Scala v2.11

Yep, I hacked up v2.11 scala-io-file release to make it happen...

https://github.com/rtyley/scala-arm/commits/fork-for-release

https://github.com/rtyley/scala-io/commits/munge-scala-2.11

It's annoying how you have to set the scala version in the travis config
as well...