* Refactor several related endpoints and views
* Redesign EnrollmentView, add TeacherContactModal
* Add "Enrollment Status" tab to TeacherClassView
* Delete PurchaseCoursesView and related files
* Style-flatten RemoveStudentModal
* Fix error handling in ActivateLicensesModal
* TeacherCoursesView loads faster by only loading course campaigns, and not load prepaids
* Updates spade.js vendor file, adds a sublime-project for developers to use
* Moves server logic away from handlers
* Moves session update logic to middleware, sets up server schema to autorender IDs as ObjectIDs
* Modernizes the supermodel loading scheme and switches from constructor to initalize
Fetching leads by name via Close.io API is not reliable. Adding two
checks to protect against sending duplicate emails:
1. Query leads via recipient email to avoid creating duplicate leads.
Duplicate leads can result in duplicate automatic emails sent.
2. Lookup lead email activity when sending mails, and compare email
templates and recipient address.
Partially fix ActivateLicensesModal.spec
[IN PROGRESS] Don't display deleted users
Move userID to classroom.deletedMembers on user delete (not retroactive)
Fix PDF links for course guides, remove old PDFs from repo
Remove deprecated SalesView
Remove underline for not-yet-linked student names
Only show class select when there's more than one
Ignore case when sorting student names
Use student.broadName instead of name for display and sorting
Fix initial load not showing progress after joining a course (hacky)
Fix text entry for enrollment number input
Fix enrollment statistics
Fix enrollment stats completely (and add back in per-class unenrolled count)
Add deletedMembers to classroom schema
More fixes to enrollment stats (don't count nonmember prepaids)
Don't use 0 as implicit false for openSpots
Update suggested number of credit to buy automatically
Fix classroom edit form ignoring cleared values
Add alert text when more users selected than enrollments available
Alert user when trying to assign course to unenrolled students
Alert user when assigning course to nobody
Add some tests for TeacherClassView bulk assign alerts
Fix TeacherClassView tests failing without demos
Use model/collection.fakeRequests :D
Remove unused comment
Fix handling of improperly sorted deleted users on clientside
Add test for moving deleted users to deletedMembers
Add script for moving all deleted classroom members to classroom.deletedMembers
Completely rewrite tallying up enrollment statistics
Fix some tests to not be dependent on logged-in user
Address PR comments
Fix default number of enrollments to buy
Fix i18n for not enough enrollments
Use custom error message for classroom name length
