CLC-4259 - Added Canvas Javascript customizations to link 'Download eGrades' option from Gradebook to LTI tool
CLC-4259 - Implemented LTI configuration for new eGrades Export LTI tool
CLC-4259 - Added AngularJS controller/template for embedded Grade Export LTI application, with CSS styling.
CLC-4259 - Added Canvas::CoursePolicy#can_export_grades? method
CLC-4259 - Added CanvasCourseGradeExportController#download_egrades_csv