Motherfucking spelling, how u do dat??
Implemented content controller.

The content controller handles requests for narrative contents, giving us greater
control over the way content is delivered to the client as well as allow us to hide
the actual media files from public view.

Updated end-user view to make use of this controller to fetch narrative images.

Added query scopes to Content model to ease retrieval of content.
Refactored out long-method.
Implemented show action for Narrative API controller.
Calculate duration of each audio file.
Updated filters to match categories.
Updated narrative count method.
Updated cards interface to handle backend language values.
Updated seeding; no longer seed static narrative. Upload sample narrative archives instead.
Empty out storage directories if possible on Narrative table down.