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.
Aah! That's it!
```[info] Passed: Total 1085, Failed 0, Errors 0, Passed 1055, Skipped 30```

`fork in test := true` wasn'e enough, I had to use `fork := true`