title: form-horizontal not working with bootstrap-sass rails gem
body: <p>I have the following new.html.erb taken and edited from the Devise gem. </p>
  
  <pre><code>&lt;h2&gt;Sign in&lt;/h2&gt;
  
  &lt;%= simple_form_for(resource, as: resource_name, url: session_path(resource_name), html:{class: "form-horizontal"}) do |f| %&gt;
  
  &lt;%= f.input :email%&gt;
  &lt;%= f.input :password%&gt;
  &lt;%= f.input :remember_me, as: :boolean%&gt;
  
  &lt;div class = "form-actions"&gt;
      &lt;%= f.submit "Sign In", class: "btn btn-primary btn-lg"%&gt;
  &lt;/div&gt;
  &lt;% end %&gt;
  
  &lt;%= render "devise/shared/links" %&gt;
  </code></pre>
  
  <p>but it returns the following instead <a href="http://imgur.com/3l4rLTW" rel="nofollow">http://imgur.com/3l4rLTW</a></p>
  
  <p>As displayed in the picture, the form did not take upon the form-horizontal property in bootstrap. The form description is above instead of next to, and somehow the checkbox is all the way to the right.</p>
  
  <p>What did I do wrong? I am following the One Month rails tutorial and it worked when I followed along with the video</p>