Feature #91
Unique constraint needs to be implemented
Feature #154
Update toTitan 0.5.0

Feature #158
Update to Cassandra driver to version 2.0.4


Updated Titan to version 0.5.0 and Cassandra driver to version 2.0.4
Feature #163
Upgrade to Cassandra driver version 2.1.1
Merge branch 'master' of git:extended-objects-titan