Added instructor create lesson
	new file:   app/assets/javascripts/coach.js.coffee
	new file:   app/assets/stylesheets/coach.css.scss
	new file:   app/controllers/coach_controller.rb
	new file:   app/helpers/coach_helper.rb
	modified:   app/models/audio_lesson.rb
	modified:   app/views/audio_lessons/_form.html.erb
	modified:   app/views/audio_lessons/edit.html.erb
	new file:   app/views/coach/index.html.erb
	modified:   app/views/layouts/application.html.erb
	modified:   app/views/lesson_topics/show.html.erb
	modified:   app/views/users/registrations/edit.html.erb
	modified:   config/routes.rb
	modified:   db/schema.rb
	modified:   db/seeds.rb
	new file:   test/functional/coach_controller_test.rb
	new file:   test/unit/helpers/coach_helper_test.rb
Merge branch 'dk-working' into dm-working

Conflicts:
	Guithub/app/views/layouts/application.html.erb
	Guithub/app/views/users/registrations/edit.html.erb
	Guithub/db/seeds.rb