Adds flask-mail
Added email template based on antwort
Sketching out the base email template
Review email looks half-way decent
Setting up mail config
Setup config for testing app engine locally
Making emails better
Remove right align on email
Moving to my branch of flask-mail until it's in head
Adds email settings page
Merge branch 'send_email'

Conflicts:
	dpxdt/server/frontend.py
Respect review email sending setting; don't email successful diffs
Adds build name to settings page
Adds retryable transactions for work queue handlers