Add MIT License

We can change licenses in the future, but MIT is a good default because it's
very open and simple, and as OSS we definitely need a license.
Merge branch 'proposal'
Database
Database V0.1
Database V0.2
Update users table
Update user index
Update database

Update names and indexes for tables sectionTAs, sectionTeachers, and
sectionStudents (which are the new names).
Update database

Add table courses and update table sections
Update database

Update assignments, grades, and policies, and other minor fixes
Update database connections
Update database

Add table sectionAssignments
Update database

Add major updates to tables based on whiteboard discussion between
Joel and Jacob.
Update database and add image of it
Update database

Remove unnecessary and problematic foreign keys in grades
Update proposal and CB notes
Update proposal with Noah's paragraph
Update proposal with schedule subsections
Merge branch 'proposal' of https://github.com/URWhiteboard/WhiteBoard into proposal
Update database with cross-listed field