hacky pass at uuid sorting

An attempt at addressing https://github.com/pycassa/pycassa/issues/217

This seems to work but I'm not all-together in love with it.  One major deal breaker issue, if you expect your column names to actually be DateTypes rather than time uuids, you will get time uuids back and be massively confused.  I'm not sure how to address that without making the stubs fully aware of the column family definition.

So this is really not a pull request, but an ask for better ideas I guess.  Thanks.