Initial commit courses_feature branch (Dan)
Implemented courses list/index (RESTful #1)
Implemented course view (RESTful #2)
Implemented input form for new course (RESTful #3)
Implemented new course creation (RESTful #4)
Implemented form to edit course info (RESTful #5)
Implemented update course info after edit (RESTful #6)
Implemented course deletion (RESTful #7)
Added validation tests to Course class for title, course_time, grade, and teacher_id fields.
Added link back to course listing page (index) on the show course, new course, and edit course pages.
Merge branch 'master' into courses_feature

Conflicts:
	config/routes.rb