Bump the cassandra versions for DataStax Community

Bumped the cassandra versions for the dsc install to:
 * cassandra = 1.2.10
 * dsc = 1.2.10-1

This is currently only being used in the local environment
Updated cassandra.yaml config in the cassandra module to 1.2.10
Merge pull request #88 from simong/cassandra

Bumped the cassandra versions for DataStax Community