r417 Upgrade: Stores > Misc. Updates

Query string search implemented in the stores search concern. A bug related to state and country fields not being populated in the search form was also fixed.

 Changes to be committed:
	modified:   app/controllers/stores_controller.rb
	modified:   app/models/concerns/store_searchable.rb
	modified:   app/views/stores/_store_search.html.erb