0.2.0

* Moved pipeline code into new file.
* Code now uses a proper cluster connection pool class that handles 
  all nodes and connections similar to how redis-py do.
* Better support for pubsub. All clients will now talk to the same server because 
  pubsub commands do not work reliably if it talks to a random server in the cluster.
* Better result callbacks and node routing support. No more ugly decorators.
* Fix keyslot command when using non ascii characters.
* Add bitpos support, redis-py 2.10.2 or higher required.
* Fixed a bug where vagrant users could not build the package via shared folder.
* Better support for CLUSTERDOWN error. (Neuront)
* Parallel pipeline execution using threads. (72squared)
* Added vagrant support for testing and development. (72squared)
* Improve stability of client during resharding operations (72squared)