* GET params in a url sent through router.navigate are lost on IE9, use document.location.href = url instead
* Temporarily put raster images in the DOM to give them dimensions so they are rendered in the spritesheet correctly
* Add {cache: false} to fetches for /hoc course instances and sessions
* 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.