When using Astyanax from Scala, we cannot depend on the SystemClassLoader
being well-defined.  I was unable to run tests due to an issue
with astyanax-entity-mapper:test; however, astyanax-cassandra tests did seem to pass.
Merge pull request #315 from splittingfield/fix_class_loader_for_embedded_cassandra

Change EmbeddedCassandra to NOT use system class loader