Dynamically load Intl + locale data to the client

Simple combo loading of Intl + locale data using the exposed Express State data.

This just uses `yepnope` in a very basic way.
I think the fact that it was tricky for you to figure out how to serve this is a key pain-point we need to make sure the docs address.

We need to eventually publish this package to Bower. And we should discuss whether it should be on the CDN.