Caching

[jaredsmithse]

We should have some internal data tree to cache all of the responses for INDEX requests so that if a user makes that call and then a GET/Show request that we already have, we just return that.

This would need to have some kind of expiration tracking and invalidation marking for when we make a PUT/POST request. Also will need to make available a force option and to update the internal data when we make DELETE requests.

This should be able to be turned off, and maybe disabled by default?