No longer require one to be signed in to view assignment stuff
Updated roster title
Course controller RESTful actions updated
deleted useless views
Made all RESTful actions and views for courses work relatively well
Fixed small bug with enrollments in assignments controller
Fixed small bug with enrollments in assignments controller
Fixed small bug with enrollments in courses controller
Updated header to show assignments stuff
Made enroll methods for User model work with course object or course id
Added and verified behavior of validations for assignment model
Fixed minor bugs with course_controller