Changed union() methods on lists to take a separate "first element"
argument in order to differentiate them to the compiler, because Java 7
considered it an error to have them all take Lists parameterized with
different types.

Java API

- Add override keywords.
- Cache RDDs and counts in TC example.
- Clean up JavaRDDLike's abstract methods.

Conflicts:

	core/src/test/scala/spark/MesosSchedulerSuite.scala

Conflicts:

	core/src/test/scala/spark/ShuffleSuite.scala

Add missing Scala Map to java.util.Map conversions.

- Replace JavaLR example with JavaHdfsLR example.
- Use anonymous classes in JavaWordCount; add options.
- Remove @Override annotations.

Add distinct() method to RDD.

Fix bug in DoubleRDDFunctions.

Scalacheck groupId has changed https://github.com/rickynils/scalacheck/issues/24. Necessary to build with scalaVersion 2.9.2. Works with 2.9.1 too.

fixes various bugs in the previous code when running on Mesos.

across projects).