app/views/users/_list.html.erb
<div class="row-fluid">
<% @users.each_with_index do |user,i| %>
<div class="span3 %> clearfix">
<li><a href="<%= user_path(user.login) %>"><i class="fa fa-user"></i> <%= user.login %></a></li>
</div>
<% if ((i+1)/4.0).to_i == ((i+1)/4.0) %>
</div>
<hr style="clear:both;"/>
<div class="row-fluid">
<% end %>
<% end %>
</div>