Added a way to enforce attendance below a certain point.
Added a way to enforce maximum attendance. Also added emails for booking and fixed a bug where cancel was doing the wrong thing.
Merge branch 'events_2.0' of https://github.com/cool-beans/Team65_buffer into events_2.0

Conflicts:
	app/templates/final_project/event_profile.html
	app/views/events.py
Added attendance rating to Member Profile.