Width of schedule table as a percentage of the page
Revert changes to schedule
Make all content on the schedule page wider
Widen conference schedule; fix nav container width
Update pycon.registration app
Move registration templates from symposion to pycon

Since all related code is in pycon rather than symposion.
Move registrations tests to subfolder
GET group registration
First pass of group registration POST logic.
Tests for Group Registration post logic
Add group registration permission via migration
WIP
Refine markup & JS; stylize output; add error messages.
Tests for group registration form
Don't send registration emails
Fix CSS typo
Update doc string