Replace mako with syllabus YAML
Remove auto margin from p tags in syllabus.
Hooray for functions! Hooray for templates!
Remove superfluous 'topics' list from extras.
Show a date if there is one in extras. Also widen the column.
Add SFD date.
Re-integrate class & extras.

They are now treated the same, except for where they aren't.
Don't need that anymore.
Rename syllabus.yaml to schedule.yaml to be more specific
Add helpful examples to the top!
Move a few tweaks from the live site back.
Merge pull request #179 from decause/feature/syllabus-dates

Feature/syllabus YAML