CLC-4526 - Moved logic for Canvas::Egrades#official_section_identifiers to Canvas::CourseSections class
CLC-4526 - Refactored CanvasCourseProvisioningController to use shared authentication and exception handling methods. Added #course_site_info to serve course site information
CLC-4534 - Adds canvas course data to feed returned by Canvas::CourseProvisiong#get_feed when canvas_course_id option present
CLC-4534 - Updated CanvasCourseProvisioningController#get_feed to use canvas_course_id parameter or session variable