Add poll editing, allow admins to view more

Allows users to edit polls
Allows admins to view current results for open polls as well as ballots on open polls.
Remove Results table

Adds on demand results calculation, removing the need for results table
Allows us to store provisional ballots which non-pollsters may submit
Adds ability to edit ballots, including prepopulation of ballot with previous submissions
add results to downgrade migration to avoid a couple errors
Merge branch 'master' into results-rework

Conflicts:
	cbbpoll/views.py
modify migration to upgrade from email-confirmation
Add ballots list to results and poll detail pages.
fixes most recent results on index
Merge pull request #17 from brandonsato/results-rework

Results rework