title: Rails 3.1 serving images from vendor/assets/images
body: <p>I am trying to put some external images (used by a jQuery plugin) to vendor/assets/images in my Rails 3.1 app. Problem is that when I try something like:</p>
  
  <pre><code>&lt;%= image_tag "ui-bg_flat_75_ffffff_40x100.png" %&gt;
  </code></pre>
  
  <p>I get an error:</p>
  
  <pre><code>No route matches [GET] "/assets/ui-bg_flat_75_ffffff_40x100.png"
  </code></pre>
  
  <p>I checked my Rails.application.config.assets.paths and it list these dirs:</p>
  
  <pre><code>..../app/assets/images
  ..../app/assets/javascripts
  ..../app/assets/stylesheets
  ..../vendor/assets/images
  ..../vendor/assets/stylesheets
  ..../.rvm/gems/ruby-1.9.2-p180@mygems/gems/jquery-rails-1.0.9/vendor/assets/javascripts
  </code></pre>
  
  <p>As you can see /vendor/assets/images is listed there. If I put my image to app/assets/images everything works.</p>
  
  <p>I thought that new asset pipeline was supposed to go through all assets dirs and serve requested file wherever it finds it.</p>
  
  <p>Does anyone knows what's the problem here?</p>