add breaking LociSet serialization case. Strangly, we can make an RDD[LociSet] fine, but attemping to use a LociSet in a closure results in a serialization error.
more LociSet serialization tests
disabling the closure LociSet serialization test for now
Merge pull request #44 from hammerlab/serialization-debug

A few more tests for Kryo-based (i.e. not from a closure) LociSet serialization