Add a 'message' field to Show.
Show the message on the front page.
Don't encourage people to use Twitter.

I just can't.
Oh, shit, we have a contributors list.

Feeling pretty silly for pointing out Tomo-san/Doujin-Release-Tracker#31
now. Maybe nobody will notice.
Remove accidentally inserted 'z'.

Dammit, vim.
Let API consumers know if the show is on the air.
Fix API redirects to align with the documentation.

Part of #117.
Include the front-page message in the show API.
Modify our build status markup so that python markdown understands it.
Include the show message on archive pages.

cc. #116
Let's not get needlessly specific at this early stage.
Create a user API that returns an empty object for users.
Start including some actual information in the user API.
Include the unfinished user API in our Instant Coverage tests.
Share the blame.
Include background art in tracks' API dicts.
Surface eligibility in the API.

This may or may not make things noticably slower. I'm scared.

cc. Tomo-san/nkdsu-hummingbird-voting-recommendation#2
Merge branch 'master' into django1.7
Convert Show.message migration from South to Django.