Use scala deprecation instead of java.

This gets rid of a warning when compiling core (since we were depending on a deprecated interface with a non-deprecated function).  I also tested with javac, and this does the right thing when compiling java code.

Author: Michael Armbrust <michael@databricks.com>

Closes #452 from marmbrus/scalaDeprecation and squashes the following commits:

f628b4d [Michael Armbrust] Use scala deprecation instead of java.

core/src/main/scala/org/apache/spark/api/java/JavaSparkContext.scala

@@ -114,7 +114,7 @@ class JavaSparkContext(val sc: SparkContext) extends JavaSparkContextVarargsWork
    * @deprecated As of Spark 1.0.0, defaultMinSplits is deprecated, use
    *            {@link #defaultMinPartitions()} instead
    */
-  @Deprecated
+  @deprecated("use defaultMinPartitions", "1.0.0")
   def defaultMinSplits: java.lang.Integer = sc.defaultMinSplits
 
   /** Default min number of partitions for Hadoop RDDs when not given by user */