Create API Data Cache Service

[maxdumas]

Instead of always pulling directly from the API, establish (or find) a service that that will cache our resources loaded from the API on the front-end, so that we can comfortably make tiny requests with impunity. A great use case for this is to simply look up the information needed to display a linked field by its rules under #71, instead of just showing its ID. It seems a bit wasteful to do that for every linked field, but if that data is then stored to be useful later, it's not so bad.

[ethanresnick]

@maxdumas Have I mentioned ember data? It does this automatically :)

[maxdumas]

We can do this very easily as it turns out! Although this is URL-based; it's not intelligent to the resource we're fetching, so a fetch of a single resource won't look up a previous fetch of the whole collection. It's still definitely an improvement, though, and we could get that behavior by maybe making a very simple wrapper on top of this.

https://github.com/mgonto/restangular#can-i-cache-requests