add app/admin/banner.rb
Merge branch 'dev' of github.com:lvl0nax/topaza_shop into backend_banners
added show for banners
Merge branch 'dev' of github.com:lvl0nax/topaza_shop into backend_banners

Conflicts:
	app/models/banner.rb
Merge pull request #10 from Neodelf/backend_banners

Backend banners