Fixes
zmq transport: Respect the timeout argument in Client.get()
Adds Jesper Thomschütz to AUTHORS
Updates Cangelog
Removes useless maybe_block
MongoDB: Connection deprecated in favor of MongoClient, and end_request no longer needed.  Re #250
Zmq: Must use finally to clear timeout
Replaces URI_PASSTHROUGH global with Transport.can_parse_url
MongoDB: Pass URL unmodified to transport.  Closes #205