Add dataset for new ACS 1 year data profiles. Update to version .6

Hi Sunlight!

Made some updates to your helpful Census Python wrapper to include new API goodies released on 9/20: data profile tables for 1-year ACS estimates. Sending them your way in case it's helpful for others.

The code handles 2012 ACS 1-year requests only--does not include the 2011 ACS-1 year requests, which are available for congressional districts only and are formatted a bit differently.