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.
Why not just?

```scala
libraryDependencies += {
  "org.scala-lang" % "scala-compiler" % scalaVersion.value
}
```