Add scala-refactoring to the community build.

I wasn't able to run the script locally (tons of EXTRACTION FAILED). I also just updated the build.sbt in scala-refactoring to build with Scala 2.11, but this isn't in a release yet so I target that specific commit.
This kind of error usually indicates mismatch of Scala library version. Did you verify that the classpath you construct is a correct one?