Removes 'create channel' feature

We don't want our first client trying to create channels. Bad UX --
confusing.

 On branch staging
	modified:   app/assets/javascripts/backbone/apps/channels/list/list_controller.js.coffee
	modified:   app/assets/javascripts/backbone/apps/channels/list/list_view.js.coffee
	modified:   app/assets/javascripts/backbone/apps/channels/list/templates/layout.jst.hbs
	deleted:    app/assets/javascripts/backbone/apps/channels/list/templates/panel.jst.hbs