title: Heroku asset pipeline isn't finding handlebars.runtime.js
body: <p>In the manifest file, we have </p>
  
  <pre><code>//= require handlebars.runtime
  </code></pre>
  
  <p>In development it works fine, but on heroku we are getting an error.</p>
  
  <pre><code>ActionView::Template::Error (couldn't find file 'handlebars.runtime'
  
    (in /app/app/assets/javascripts/application.js:11)):
      1: = javascript_include_tag 'application'
      2: = javascript_include_tag "#{params[:controller]}/#{params[:action]}" if js_file_exists?("#{params[:controller]}/#{params[:action]}")
      3:     
      4: -#  Append your own using content_for :javascripts
    app/views/layouts/_javascripts.html.haml:1:in `_app_views_layouts__javascripts_html_haml__1848877102237238272_50436400'
    app/views/layouts/landing.html.haml:35:in `block in _app_views_layouts_landing_html_haml__157312279246923607_45507260'
    app/views/layouts/landing.html.haml:3:in `_app_views_layouts_landing_html_haml__157312279246923607_45507260'
  </code></pre>
  
  <p>We aren't precompiling and we dont get any errors on the compile on heroku.
  Any ideas on how to get this working properly?</p>