Added page title with submenu options.

I've added a new component "page_title_nav", but this is ment to replace the "place_title" component. 

I've added new options to show submenus below the place-titles, so you can navigate through the siblings of the sections/sub-sections.

This is how it looks:
![page-title-nav](https://cloud.githubusercontent.com/assets/1152640/5227743/84a8a1a6-7700-11e4-8930-00f6668860c3.gif)