Add support for cassandra

Added support for cassandra 2.0.

The gini/cassandra puppet module is not up to date with cassandra 2.0 and waiting on a pull request to be merged.  This pulls from that fork and has some settings for it to run.  When that gets merged we can change it to point to that version.

Also wondering if I need to add a way to auto require the 'openjdk-7-jre' package for a requirement to cassandra.