Sketch in basis for schedule work
Change model structure
PEP8
Add simple test cases
More templately
Fix urls
Set ordering on venues
Fill in a bunch of view work
Better str for slots
Add methods used in template and fix template logic
More test work
Don't use none as placeholder, since we've changed the logic in the template
Hack in colspan support
Add migration for schedule app
Tweak required fields on models
Add basic admin form
Restrict list of talks to accepted ones only
Fix table formatting
Use dict and sorting to avoid ordering issues when assigning items
Update tests to changed view api