Recommendation: use bluebird instead of q for promises.

[jniles]

So far, we've been using q as our Promise implementation on the server. An alternative is to use bluebird, a fast promise implementation that is built with NodeJS specifically in mind. I'd like to change library for three reasons:

1. A better API - we no longer need to use the ugly .done() syntax, built-in support for .map(), etc.
2. Faster than both q and native promises.
3. Potentially to use bluebird.promisify() to replace db.exec().

A third alternative is to simply use NodeJS promises, but it seems that bluebird is faster than Native promises and gives us more flexibility in the API than a strictly A+/Promise implementation.

Since we are currently rewriting APIs, it makes sense for this change to land now. Curious to know what other developers think though.

[jniles]

Closing this as irrelevant. Eventually we may just use native Promises.