reserve_tickets cookie is now an object with gig_id and order_id. releasing reserved tix due to user navigating away during purchase is somewhat implemented. MAJOR CHANGE. also need to consider how to close purchas-with... and credit-card... views after said navigation. because they are not closed currently
gigs now have a main_img_url and thumbnail_url fields in database. update the UI to reflect that: gig list uses thumbnails and gig details uses the main image.