removes refs to temp and hides pieces on displayed
corrects typo
actually fixes typos this time.
Merge pull request #44 from osulp/features/Display

removes refs to temp and hides pieces on displayed
removed photo from art piece and art piece table
removed photo from art piece index view
removed photo from index and show views
added art piece photos and added their ids to art pieces
refined has many belongs to relation
Added single picture viewer on index page
can add multiple photos to an art piece
can view single photo in index view and multiple in show view
fixed bug in show_default
fixed bug in show_default
moved cats from assets to fixtures