Merge pull request #26 from lessandro/selectdb

Reset selected db after reconnecting
Added a 'disconnect' message kind to the Pub/Sub Message class.
Updated the websockets demo. Added a docstring to the Client.listen method.
Bumped the version number.
Added Lessandro Mariano to the list of contributors.
Fixed a typo in README
And re-fixed it.
Notify the client about connection exceptions