Auto-reconnect when 'read error on connection' after first request using persistent connections.
Unsubscribe calls cause subscribe to return

My experience with pubsub is that if you unsubscribe from a channel the
subscribe calls will continue to wait for messages.  This change checks
to see how many channels or patterns are being waited on and if the
number is zero the subscribe call will return.
Merge pull request #33 from kschroeder/master

Unsubscribe calls cause subscribe to return
Add proper vardocs. Restore unsubscribe and pUnsubscribe return values.
Merge pull request #3 from colinmollenhour/master

Update from Origin