Make spark.repl.Main.interp_ publicly accessible (so Shark can get rid

of a weird file dediated to accessing this variable).

repl/src/main/scala/spark/repl/Main.scala

@@ -7,7 +7,7 @@ object Main {
   
   def interp = _interp
   
-  private[repl] def interp_=(i: SparkILoop) { _interp = i }
+  def interp_=(i: SparkILoop) { _interp = i }
   
   def main(args: Array[String]) {
     _interp = new SparkILoop