[CLC-2629] Add admin bCourses course provisioning as external app in bCourses

Added route for course provisioning config
Added XML config for course provisioning LTI app
Added CanvasLti controller method to serve XML config
Including course provisioning script in LTI embedded template
Reconfigured back-end references from 'course_provisioning' to 'course_provision' to follow Ray's convention
Added AngularJS route for embedded course_provision display
Applied call to resize iframe to parent window for bCourse provisioning
Merge pull request #1721 from redconfetti/CLC-2629

[CLC-2629] Add admin bCourses course provisioning as external app in bCourses