Adding listing route, added show from listing controller, remove quantity/ condition from the listing model, added navbar back to master blade file and added an option to sell a card.
Merge branch 'marketplace' of https://github.com/StyleASD/team_citadel into marketplace

Conflicts:
	app/controllers/ListingController.php
	app/models/Listing.php
	app/routes.php
	app/views/create-listing.blade.php