* Add alert explaining when a user joins a course, and links directly to the course
* Add header to My Courses list
* Have My Courses list sorted by classroom creation then course creation
* Handling prepaids with strings for maxRedeemers
* Add link to TeacherCoursesView from HourOfCodeView
* Show only course instances with classrooms attached in TeacherCoursesView and StudentCoursesView
* Add event tracking to HourOfCodeView
* Add not-logged-in handling to TeacherCoursesView
* Fixed a GET prepaids bug
* Have course instances created for hour of code have hourOfCode property set to true.