Async Calls Won't Hit Cache

My use case is that I'm calling the $.render method within a loop. This results in 30 or so render calls, none of which hit the cache, so 30 separate XHR requests are made.

The temporary fix I've implemented is to use `async: false` on the XHR request, but that's not an ideal solution.

Perhaps a method of preloading templates, or passing in configuration for the XHR, would be better suited.
