Add ``Pages`` to demostrate the featured applications.
Add admi to add Applications to the Pages.

https://github.com/madewithbytes/us_ignite/issues/79

The applications can be added to a page and ordered
in the admin.
Add featured page for the ``Applications``.

https://github.com/madewithbytes/us_ignite/issues/79

There can only be a single ``FEATURED`` page, this will be
available under ``/apps/featured/``.

The page will show an ordered list of selected applications
for the given page.