Sort grade distribution graphs on grade lookup page

[kandasamyc]

On the historical grades lookup page, when inputting a professor, we display graphs for each of the courses they've taught. For ease of viewing, we should sort the courses by most recently taught and most students. That is, first we put the most recently taught classes at the top, and then for ties, sort by most students (more students higher).

[saewitz]

I don't really agree, alphabetical is more predictable so it's easier to find the course you might be searching for