Filtering w. proc for attendees and callers+tests
Update host partial to exclude flakes from group mail
Comment optional argument for attendees

Per Mehul's code review
Merge branch 'master' into attendee-mail-fix

Conflicts:
	app/views/profiles/_host_tea_time_info.html.haml
Merge branch 'attendee-mail-fix'

Conflicts:
	spec/models/tea_time_spec.rb