v1.0.0 and ioredis

• move to the ioredis package from redis (this allows sentinel and cluster support in one package)
• connection errors on queue, connection, worker and scheduler are now all emitted rather than called-back. Be sure to check for this new event!
• the creation of a new queue, worker, scheduler, connection object no longer have callbacks. They all have a connect() method instead.
• multiworker.start() will now wait for the first worker to start before returning