Scala 2.10.0 cross compilation and scalaz version bump.

The goal of this is to get scala-machines cross compiling against 2.10.0 and
using stable scalaz builds.

This change includes:
 - Update sbt to 0.12.1
 - Update scalaz dependency to 7.0.0-M7 which is latest published stable
 - Update scalacheck to 1.10.0 which is only available against 2.9.2 and 2.10.0
 - Scalac option shenigans for 2.9.2 vs 2.10.0

Note: There are still a number of compiler warnings when building with 2.10.0,
      specifically non-exhaustive pattern matching on Process without handling
      Return(_) as well as some deprecation warnings.