Initial steps on order email sending. Refactored email sending to all use same html conversion process.
Set up basic order receipt email which probably looks super shitty right now.
Merge branch 'master' into ticket/124

Conflicts:
	brambling/models.py
Added basic organizer alert email template.
Hooked order email sending into order payment process.
Actually did work on email template.
Improvements to receipt email.
Tweaked/simplified order receipt email.
Tweaks / improvements to order receipt email.
Merge pull request #262 from littleweaver/ticket/124

Ticket/124