Feature/carousel

Imported code from bootstrap for carousel, added require bootstrap.js and added carousel.js
what about:
 -  <% if Array.wrap(document["art_piece_photos_sms"]).length > 1 %>
 +            <% Array.wrap(document["art_piece_photos_sms"]).each do |photo| %>
 +            <% @first = (photo == Array.wrap(document["art_piece_photos_sms"]).first)
 +              <div class="item active"> if @first
 +              <div class="item"> unless @first
 +                <%= image_tag photo %>
 +              </div>
 +            <% end %>