ESify feed detail views, prereq to slimming down the homepage

In order to slim down the homepage, I need to speed up the feed detail views. The homepage is currently fat in order to have everything cached by the time the user heads to the feed detail pages. To slim down the homepage, we need to get the feed detail pages less reliant on the homepage view, and give it its own ES view.

- Should I replace the viewset URL rather than having a new URL appending ```/get/```?
We should use multi_fields for this: http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/_multi_fields.html

Then you can do filters or exact matches on `slug.raw`, e.g. I'm not sure if this is a 1.0+ feature or not. If so we can use the old syntax but convert it when we go 1.0.