Quick attempt at a Rules subapp.

Main cool things:

   * We use django-markupfield to choose a markup language. So far,
     I've enabled markdown and plain-text (plain-text will still add
     urls and paragraph tags, so it's still pretty cool).

   * With markupfield and markdown, we now have third party
     dependencies... it seemed like a good time to get a
     requirements.txt file set up.
Remove BaseRule from the database.
Merge pull request #115 from jthemphill/feature/rules_page

Quick attempt at a Rules subapp.
Merge pull request #120 from jthemphill/develop

Registration fixes
Refactor game retrieval functions

In order to fix the context bar, we'd need another game retrieval
function. This commit creates one game retrieval function with three
flag arguments, which covers all our needs elsewhere.

`nearest_game` is renamed `imminent_game` because that word better
explains that the function is getting games from the future.
Fix breakout bar.

The breakout bar now looks at the game in progress or most recent game.
If there are no games, we display an empty bar.
Fix decorators and validators in the 0 and multi-game cases.
Fix meal ticker.

The meal ticker also needed to only display results from this game.
Merge pull request #125 from jthemphill/new_fixes

Game-based fixes
Remove initial_data.json
Merge pull request #127 from jthemphill/initialization

Remove initial_data.json
Upgrade Django

Django is now at version 1.4.5.
Add missions.

There are Missions and then there are Plots. Each Mission should have
one Plot for each team.

Test coverage is still pretty bad, and I have done absolutely no
styling.
select day and time for feeding
Merge pull request #128 from jthemphill/develop

Upgrade Django to 1.4.5
Replace outcome node with in-template logic.

Something something lesser of two evils.
Authentication

So humans and zombies can't see each others' mission stories.
Create a player list.

Not quite two lines, but close. No styling yet.
Allow developers to specify the current date and time.

Now we can put the current date and time in a callable within settings,
allowing us to change the current date and time in tests or
local_settings.
Create ipsum fixtures for players and rules.

The game is set to April 2, 2013, when I think the next spring game
will be. You should set the website's time to some point during the
game if you want to take advantage of the ipsum fixtures.