number of partitions we ask to partition it into. Also, removed a test
that was taking way too long to run.

Changed HadoopRDD to get key and value containers from the RecordReader instead of through reflection

wait() with a timeout of 0 on a Java object means "wait forever".

Adding sorting to RDDs

synchronization change

Conflicts:
	core/src/main/scala/spark/DAGScheduler.scala
	core/src/main/scala/spark/SimpleShuffleFetcher.scala
	core/src/main/scala/spark/SparkContext.scala

and made DAGScheduler automatically set SparkEnv.

Added immutable map registration in kryo serializer

Made improvements to takeSample. Also changed SparkLocalKMeans to SparkKMeans

I've fixed the bugs detailed in the diff. One of the bugs was already
fixed on the local file (forgot to commit).

Fixes #105.