Added multiple items to include a Pages controller and routes.

* Added a Pages controller to handle semi-static page serving
  such as index, services, contact_us, etc. See controller.

* Added routes for Pages controller to serve actions off root
  for example '/about' rather than 'pages/about'

* Added feature to test creation of Shelters

* Updated RescueGroups Controller methods to baseline requirements

* Changed RescueGroup controller test to test delete not destroy