Bare bones Marionette layouts.

 On branch app_layouts

	modified:   app/assets/javascripts/backbone/apps/properties/properties_app.js.coffee
	new file:   app/assets/javascripts/backbone/lib/components/layouts/header_sidebars/header_sidebar_app.js.coffee
	new file:   app/assets/javascripts/backbone/lib/components/layouts/header_sidebars/header_sidebar_view.js.coffee
	new file:   app/assets/javascripts/backbone/lib/components/layouts/header_sidebars/layout_controller.js.coffee
	new file:   app/assets/javascripts/backbone/lib/components/layouts/header_sidebars/templates/layout.jst.hbs