Add badges tab to profile page
Add new badge icons
Fixed display bug
Added Code to handle students that haven't earned any badges
	modified:   app/models/lesson.rb
	modified:   app/models/merit/badge_rules.rb
	modified:   app/views/lessons/show.html.erb
	new file:   app/views/shared/_user_badges.html.erb
	modified:   app/views/user_badges/index.html.erb
	modified:   app/views/users/registrations/edit.html.erb
	modified:   config/environment.rb
	modified:   config/environments/development.rb
	modified:   config/initializers/merit.rb
	modified:   config/routes.rb
	new file:   public/images/badges/.directory
	new file:   public/images/badges/building.png
	new file:   public/images/badges/guitar.png
	new file:   public/images/badges/head_phones.png
	new file:   public/images/badges/keyboard.png
	new file:   public/images/badges/mic.png
	new file:   public/images/badges/on_fire.png
	new file:   public/images/badges/record.png
	new file:   public/images/badges/single_note.png
	new file:   public/images/badges/speaker.png
	new file:   public/images/badges/talking.png