title: Background images in rails production don't work
body: <p>Background images in rails 4(production env) don't work. It seems to me that there is a problem with asset pipeline. When I write in css:</p>
  
  <pre><code>selector{
    background-image: url(image.jpg)
  } 
  </code></pre>
  
  <p>it generates <a href="http://myapp.com/assets/image.jpg" rel="nofollow">http://myapp.com/assets/image.jpg</a> and it doesn't work. If I change url manually to 
  image.jpg-fingerprint(from public/assets) then everything is okay.</p>
  
  <p>ckeditor also doesn't work.</p>
  
  <p>Here is my production.rb</p>
  
  <pre><code>  config.cache_classes = true
    config.assets.enabled = true
    config.eager_load = true
    config.assets.precompile += Ckeditor.assets
    config.consider_all_requests_local       = false
    config.action_controller.perform_caching = true
    config.assets.js_compressor = :uglifier
    config.assets.compile = false
    config.assets.digest = true
    config.assets.version = '1.0'
    config.action_dispatch.x_sendfile_header = 'X-Accel-Redirect'
    config.log_level = :info
    config.log_formatter = ::Logger::Formatter.new
  </code></pre>