Move episodes & lists into partials.
Dispatches `http/ACCEPT` header to the controller so it can decide how to respond.
POC JSON response w/ client side tempting.

If the user has javascript enabled and they select a different search parameter
(on `/torrents/tv`) the list will dynamically repopulate with that categories results.

In the future we could use this for auto-complete, or just fetching the results in line.

Real advantage here is that you can now fetch series & episodes through JSON simply
by calling `/torrents/tv/(series | episodes)` with `Accept: application/json`.