Add the IndexView to the App.
Change the routing such that we don't instantiate views on every routing event.  Create instances in the global namespace (for now).  Add a showView() function to AppView that is our view switcher (needs work to close/unbind views as needed, and transition as needed). Add in the routing for the AboutView.
Include AppModel to handle headerType when rendering different views
(index vs. other). AppView.showView() does the switching (more to come
there foro smooth and clean transitions).