ERR max number of clients reached

Are there any instructions required in the README to listen for and close redis connections for jobs as they finish?

`var jobs = kue.createQueue({redis:{...}});`

Or perhaps there is a way to dictate an upperbound to Kue itself for the max # of redis connections that we want it to make?

Read the README and trace the createQueue({redis:{...}}) entry point to understand how Kue opens and closes Redis connections for jobs. Done should either document the required connection lifecycle or specify and implement a supported upper bound for Redis connections.

Written by the indexing model from the issue text.