WIP: Upgrade to Scala 2.10.x

This upgrades to Scala 2.10.3 (guess that should be 2.10.4 now), SBT 0.13.1, and it's new `build.sbt` syntax.

There's also various formatting tweaks where updates were done to get the project inline with the Scala Style Guide.

The project compiles now and tests run but there are 15 failures out of 44 tests. I think mostly related to updates in Spray and Akka.