Remove Scala 2.10 mentions in build.sbt (#1884)
Remove Scala 2.10 mentions in build.sbt (#1884)

Since we don't support Scala 2.10 anyway I've removed all Scala 2.10 related code from `build.sbt`.
twitter/scalding,twitter/scalding,twitter/scalding,jzmq/scalding,jzmq/scalding,jzmq/scalding