Some minor improvements to navigation and venue display.

Conflicts:
	controllers/venues.py
Minor fixes.
Switched to using emails as user identification.

Conflicts:
	controllers/submission.py
Some cleanup.

Conflicts:
	controllers/venues.py
Changed the default of the number of submissions.
Fixed some smaller bugs.
Fixed email -> user in submission.py
Fixed feedback.py for email -> user.
Small fixes.
Some small fixes.
Some other minor fixes.