Find class start dates for ArtSci courses

[Shadowen]

Right now we look up the end date in the master engineering timetable, then default to the start of classes for ArtSci courses in 2015/2016 (hard coded).

Scraping the start date would definitely be better. The additional information such as professors is a bonus.

[Shadowen]

Consider the official timetable. It looks difficult to scrape and doesn't actually contain start dates.

Another choice is important dates (winter. Hopefully the naming scheme is consistent enough to use a scraper on an arbitrary year. This page looks a bit tricky to scrape because the descriptive text may not be identical across years.

[Shadowen]

3fbc3bd introduces default dates. The default is the first of September/January for the timetable's session. This is a temporary fix that should last until the actual start date of the course can be found through official channels.