exposing all redis methods (incl. EventEmitter)

Hi @apechimp !
I ran into a situation where I needed to respond to error and connect events, but found that those where not actually exposed. This PR exposes _all_ redis methods.

Thanks!
A.
Haha, that's true :)

Even better though it allows for a relatively painless transition of an existing code base over to promises, which is probably a valuable feature. I'd even go so far and put the wrapper in a separate function so that you can create a `romis` object from it an existing `node-redis` object. Put I'll leave this open for the future. :)