Feature/carousel

Imported code from bootstrap for carousel, added require bootstrap.js and added carousel.js
```html
<% Array.wrap(document["art_piece_photos_sms"]).each_with_index do |photo, index| %>
     <div class=<% if index %>"item"<% else %>"item active"><% end %>
         <%= image_tag photo %>
    </div>
<% end %>
```