CLC-4487 - Added cross origin access headers to CanvasCourseGradeExportController#is_official_course API end-point
CLC-4488 - eGrades Export Tool: Refactor Javascript to link to eGrades Export tool installed in 'Official Courses' sub-account
Merge pull request #3137 from redconfetti/CLC-4488-egrades-official-course-js-link

CLC-4488 - eGrades Export Tool: Refactor Javascript to link to eGrades Export tool installed in 'Official Courses' sub-account