added cassandra driver
Merge pull request #10 from amitgandhinz/master

added cassandra driver
added cassandra driver
fix merge conflicts
Merge pull request #11 from amitgandhinz/master

added cassandra driver
Merge remote-tracking branch 'upstream/master' into github

Conflicts:
	api/toystory/storage/base/__init__.pyc
	api/toystory/storage/base/driver.pyc
	api/toystory/storage/memory/controllers.pyc
	api/toystory/storage/memory/driver.pyc