fixed application layout
fixed double notice

 Changes to be committed:
	modified:   app/views/layouts/application.html.erb
	modified:   app/views/trips/show.html.erb
added my_trips

 Changes to be committed:
	modified:   app/controllers/trips_controller.rb
	modified:   app/models/ability.rb
	modified:   app/views/layouts/application.html.erb
	new file:   app/views/trips/my_trips.html.erb
	modified:   config/routes.rb