- Use upstream source URL

- added requirement python-py
- Update to 2.7.6:
* Added CONFIG RESETSTAT command. Thanks Yossi Gottlieb.
* Fixed a bug introduced in 2.7.3 that caused issues with script objects
and pipelines. Thanks Carpentier Pierre-Francois.
* Converted redis-py's test suite to use the awesome py.test library.
* Fixed a bug introduced in 2.7.5 that prevented a ConnectionError from
being raised when the Redis server is LOADING data.
* Added a BusyLoadingError exception that's raised when the Redis server
is starting up and not accepting commands yet. BusyLoadingError
subclasses ConnectionError, which this state previously returned.
Thanks Yossi Gottlieb.
- Changes in 2.7.5:
* DEL, HDEL and ZREM commands now return the numbers of keys deleted
instead of just True/False.
* from_url now supports URIs with a port number. Thanks Aaron Westendorf.
- Changes in 2.7.4:
* Added missing INCRBY method. Thanks Krzysztof Dorosz.
* SET now accepts the EX, PX, NX and XX options from Redis 2.6.12. These
options will generate errors if these options are used when connected
to a Redis server < 2.6.12. Thanks George Yoshida.
- Changes in 2.7.3:
* Fixed a bug with BRPOPLPUSH and lists with empty strings.
* All empty except: clauses have been replaced to only catch Exception
subclasses. This prevents a KeyboardInterrupt from triggering exception
handlers. Thanks Lucian Branescu Mihaila.
* All exceptions that are the result of redis server errors now share a
command Exception subclass, ServerError. Thanks Matt Robenolt.