Version History
---------------
- 2.0.1 [2014-11-14]
 - Add db_url parameter to both session class initializers.
- 2.0.0 [2014-10-07]
 - Change the environment variable format to be URI based instead of a variable per host, port, dbname, etc.
- 1.0.1 [2014-09-05]
 - Expose psycopg2/queries exceptions, objects, etc from ``sprockets.queries.postgresql``
 - Add integration testing with PostgreSQL
- 1.0.0 [2014-08-29]
 - Initial release