Toggle left sidebar collapse.

 On branch left_sidebar

	modified:   app/assets/javascripts/backbone/lib/components/header/show/show_controller.js.coffee
	modified:   app/assets/javascripts/backbone/lib/components/layouts/header_sidebars/header_sidebar_view.js.coffee
	modified:   app/assets/javascripts/backbone/lib/components/layouts/header_sidebars/layout_controller.js.coffee