Can export a single course to XLS
Tested sufficiently. Moved conversion to the model
Merge branch 'integration' into feature/28-Export_Single_Course

Conflicts:
	app/controllers/course_controller.rb
Merge branch 'feature/28-Export_Single_Course' into integration
Suitability algorithm done and displayed
Merge branch 'feature/25-tutor_suitability_algorithm' into integration
Merge branch 'integration' into feature/37+41-course_tutor_number

Conflicts:
	app/models/course.rb
	db/schema.rb