Add category label to podcast#show
Move list of podcast template from subscriptions to podcasts/index
Add category show ember view

Some of the code in this commit is really hacky. I don't like that ember
pluralizes 'category' to 'categorys'.
Commiting backup podcast list
Add podcast index sorted by subscription count.
List categories next to podcasts
Merge branch 'categoriy-ui'
Fix subscriptions_count migration