update styling on admin section of site
Update Pages Edit Page to provide side-by-side "live" previews

* Makes the editor substantially easier to use
* Cleans up the form to be more friendly.
Update color choices on admins page, improved styling for pages views
Images must require URL and description, gallery validates images
Redirect to root path if end user tries to access unknown gallery.
Style Superuser section of site.
remove unused galleries files
Clean up markup for Pages views, copy edits, make generic metadata ID
Formatting cleanup in admin galleries controller
Styling updates to End-user site

* body font is now sans-serif
* Sidebar "correctly" partialed off, still somewhat broken but will
  work.
Ensure page URLs are based on the root of the site.
Improve Gallery Creation/Editing Form

* Looks nicer, correctly removes entries
Centralize gallery rendering into its own partial

* called when previewing a gallery from admin backend and when showing
  galleries.
Improve admin views for galleries.
Show number of images in gallery next to the gallery title