Update wording on artwork index & edit pages
Delete test folder; add static_pages controller
Make title a mandatory field for Artwork; make name a mandatory field for Tag; add for_sale and price to Artwork and make it editable in the form
Add partials for artworks that are for sale -- short and long version for store index and show (need to think through if this needs its own controller)
Modify tags_attributes= on Artwork class so that it works if there are no spaces used with the comma separators
Create store controller with index and show actions -- these reference partials in the app/views/artworks folder; the goal is to easily have two different views for an item depending on if the item is for sale; the edit action (accessible from both views) points to the same page