Create Listing show and index

* Create partial for listing
* Create show page for listing
* Create index page for listing
* Edit listing controller
* Edit routes
missed files in previous commit
remove edit from listings controller
Listing Update and Edit

* Add listing update controller action
* Add listing edit controller action
* Edit routes to except: [:delete]
* Created a form partial
Url to image_url

* change url to image_url
Add migration to change url to image_url
Merge pull request #9 from Metis-AAE/az-more_listing

Az more listing