Performance improvements

[mlewand]

We need to improve core Quail performance.

We have already shown that some fixes will bring major benefits for Quail, while we were working on jQuery improvements.

We'll add more details soon, and send a PR with our current changes.

[jessebeach]

I looked at https://github.com/jgallen23/jquery-builder as a path to building a custom jQuery distribution in Quail. I wasn't able to get it working tonight. But it does seem doable; there's just a few moving parts and I couldn't get them all moving in the same direction right now.

[mlewand]

Great! We could definitely use something that will allow us to automate jQuery build process.

I took just a look at their readme, and they list less modules than jQuery offers ATM, I believe that it's due to fact that the last jquery-builder commit was in October 2014. We're going to figure out if we can make an use of it.

Let's move further jQuery-related discussion to #100, as this issue is restricted to Quail core.