Merge pull request apache#410 from rxin/scaladoc1

Updated JavaStreamingContext to make scaladoc compile.

`sbt/sbt doc` used to fail. This fixed it.

streaming/src/main/scala/org/apache/spark/streaming/api/java/JavaStreamingContext.scala

@@ -132,7 +132,7 @@ class JavaStreamingContext(val ssc: StreamingContext) {
    * Re-creates a StreamingContext from a checkpoint file.
    * @param path Path to the directory that was specified as the checkpoint directory
    */
-  def this(path: String) = this(new StreamingContext(path))
+  def this(path: String) = this(new StreamingContext(path, new Configuration))
 
   /**
    * Re-creates a StreamingContext from a checkpoint file.