Add knowledge attribute to player.
Add list of completed classes to each player.

This list will be used to keep track of whether the player has
completed a particular class or not.
Adding a few classes to university.

Each class has a title, a knowledge_value that the class will add
to the player, a time cost for taking the class, a base
knowledge_required before taking the class, and a prerequisite
class_required if necessary.
Added symbols for the classes at the university.
Added Education menu.
Changed class to course so python wouldn't go nuts.
Added courses to a location.

This also adds the 'add_course' and 'get_course_by_number' helper
functions.
Parse the courses available in this location.
Missing comma in map file.
A bunch more missing commas from the map file.
Extra comma in map file.
Adding Course class.
Add necessary imports.
Change a few 'class' instances to 'course'
Missing commas
Typo in adding options for CourseMenu
Change ClassMenu to CourseMenu in CourseMenu class.
Wrong title in CourseMenu
Limit the course options to courses the player is qualified to take.

Also, once the player has taken the course, do not show it as an option.
Make arguments required in display under CourseMenu