Changed mode interface
Back-end view user privileges with seeding. Mode logic for index page. View action routing.
Merge branch 'view-selection' of https://github.com/phgrads/SceneStudio into view-selection

Conflicts:
	.gitignore
	app/controllers/scenes_controller.rb
	app/views/scenes/edit.html.erb
	config/routes.rb
	public/gl_app/gl_app.css
	public/gl_app/javascripts/App.js
	public/gl_app/javascripts/main.js