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.
Minor annoyances.
Change one-off ipsum script into a django-admin command.
Add a sane error message if no imminent game exists.

Still not sure what to do if a game does exist but already has
(possibly non-random) players defined.
Fix an issue with preexisting users.
Completely random strings, fix username collisions

No pickled names anymore, and usernames now don't imitate the email
domain address of a certain liberal arts college. You still shouldn't
use this on production, of course.
Merge branch 'develop' into feature/ipsum

Conflicts:
	HVZ/HVZ/main/validators.py
	HVZ/HVZ/rules/models.py
Merge branch 'develop' into feature/ipsum

Conflicts:
	HVZ/HVZ/rules/templates/rules/rules.html
merging in develop
Merge branch 'jthemphill-feature/ipsum' into develop