added association for appointments to have a teacher
adding functionality of teacher creating pairing sessions, still need to implement functionality of students signing up
small fix in content
added button to view to allow students to sign up for pairings, still need to implement back-end functionality
implemented views for appointments so that students can sign up for existing appointments given that there is a spot open
wrote javascript to sign students up for appointments
changed appointment controller to receive ajax request to add student to appointment
tidied up home view a little
Merge pull request #4 from chriswright47/mvp

Mvp