I have several javascript plugins in my app already and they work find (select2, bootstrap-datetimepicker, ckeditor, ace, chartkick)

trying to get jquery-ui running to add some sortable lists/tables.

Can't get Jquery-ui running in a rails 4 app...

```
# Gemfile
gem 'therubyracer', platforms: :ruby 
gem 'jquery-rails'                        
gem 'jquery-ui-rails'
gem 'non-stupid-digest-assets', '~> 1.0.4'

# app/assets/javascripts/application.js
//= require jquery
//= require jquery_ujs
//= require turbolinks
//= require_tree .
// = require jquery.ui.all

# app/views/rates/show.html.erb
<ul id="rates">
<% @plan.rate_items.each do |rate| %>
  <%= content_tag_for(:li, rate) do %> 
    <%= rate.name %>
  <% end %>
<% end %>
</ul>

<%= content_for :page_javascript do %>

<script>
$(document).ready(function(){
    $("#rates").sortable();
});

</script>
<% end %>

```

When I look at the console I just get:

```
TypeError: $(...).sortable is not a function

```