The Flash and fixes to styling
 Changes to be committed:
	modified:   app/controllers/events_controller.rb
	modified:   app/views/events/edit.html.erb
	modified:   app/views/events/index.html.erb
	modified:   app/views/events/new.html.erb
	modified:   app/views/events/show.html.erb
	modified:   app/views/layouts/_sidebar.html.erb
	modified:   app/views/layouts/application.html.erb
	modified:   app/views/shared/_errors.html.erb
	modified:   spec/features/list_events_spec.rb
	modified:   spec/features/navigate_events_spec.rb