Added a landing page and application.index route.  User now can navigate away from that route, but the outer template does not render.
Landing page works, also navigating between routes works with consistent appearance.
Updated look of application index route, login, signup, and changed logout transition to return to the application index.
Merge branch 'landing-page' into dmitry-client-text
Added an antiquey map image (in public domain) on cover page for aesthetic wonderfullness.
Removed unused links from footer, copyright note retained
Added authentication wall around trips route, trip route, and add route.