Add timer summary to the toolbar

Show comparison bars for timing in toolbar

Click on a timing and you see the "ghost" bars in the other rows, showing you
what happened at the same time. Also sort the rows by the start time, not the
end time.

Hook into Django ORM signals (save, delete)

Celery support

Add Git-based versioning

Temporary, to be replaced with a more robust solution (like NumPy etc.) once we
understand Python packaging better.

Add DB query type to key

Move StatsD init to models.py

Away from __init__.py, so we can use it in setup.py

Move NoseStatsD back to __init__.py

Needed as entry point for Nose testing

Defer loading StatsD in Nose

setup.py loads it, but no Django settings exist, chaos ensues.