Added a bunch of courses, along with some more items and jobs.
Added a few more items.
Converted double-digit numbers to letters
Fixed traceback with a letter as course symbol.

This changes get_course_by_number to get_course_by_symbol, which is more in line with some of the other methods of location.py. The course symbols are now all strings (even though they are numbers for courses 1-10).
Merge pull request #92 from ChodeGames/townville_map

Townville map