title: how to properly display a font awesome icon in haml
body: <p>I'd like to add the fa-sort icon from font-awesome to a rails application. I'm using bootstrap, and haml, and I can't seem to figure out how to set this up properly. I'd like the sort icon beside this. I tried at the end before the parenthesis closes :class => fa_icon :sort) however, that's not working. then, I tried adding .feature-icon.fa.fa-sort below the table head, and this isn't working properly either. I've added the correct gem, and called it's dependencies in the application.css structure, but for obvious reasons, can't figure this one out, please shed some light. thanks. </p>
  
  <pre><code>%th= link_to Org.human_attribute_name(:department), params.merge(sort_field: :dept, sort_order: sort_order)
  
  %th= link_to Org.human_attribute_name(:name), params.merge(sort_field: :name, sort_order: sort_order)
  </code></pre>