Fix race condition in SparkListenerSuite (fixes SPARK-908).
Fixed comment to use javadoc style
Style fixes
Fix Chill serialization of Range objects, which used to write out each
element, and register user and Spark classes before Chill's serializers
to let them override Chill's behavior in general.
Merge pull request #50 from kayousterhout/SPARK-908

Fix race condition in SparkListenerSuite (fixes SPARK-908).
Merge pull request #49 from mateiz/kryo-fix-2

Fix Chill serialization of Range objects

It used to write out each element one by one, creating very large objects.