Resolved issue #174

Added sanity checking to make sure that course number is numeric and is
< 20 digits in length
Resolved Issue #155

Send a cancellation notification email to the student, the faculty
advisor, and the registrars office.

Also, created a Registered to Cancelled state transition.
Resolved issue #176

Added an override for the z-index assigned by the default ui-front
style.
Merge pull request #177 from jacobpollard/master

Fixes course number field length, cancellation email, faculty dialog box #174 #155 #176