Change hadoop to CDH4-mr1

This commit swaps out the hadoop1 jar for the CDH4 hadoop2-mr1 jar.

We also pull in a custom version of cassandra-all that uses CDH4.
Global FaunusGremlin variables available in ScriptEngine contexts. Fixes #136
Revert "optimized the VertexQueryFilter.defaultFilter() method to not iterate if various filters are not defined."

This reverts commit c9258c3fd18fec81a9a962c6ec01b393f6697a9f.