Model for attributes bundles

Attributes bundles leverage postgres' key value store: hstore.
A bundle can be populated from an hstore's mapping.
List episodes in [reverse] order they were added.
Testbench for grouping by series.
Allow torrent download from series listing.

* Removes episode listing
* Adds torrentId to episode bundle
* Populated from join.
Merge branch 'feature/torrent-tv' into develop