title: Paperclip, set path outside of rails root folder
body: <p>I have two separate rails apps, say MyApp and MyAppAdmin. In MyAppAdmin there is ability to attach images with paperclip gem, this images should be available on the first app (MyApp).
  F.e. I may add a user avatar in MyAppAdmin, and it should be displayed in MyApp.</p>
  
  <p>How can I set path for the images that would point to common 'shared' folder, which these two apps can use? </p>
  
  <p>I tried to use something like <br>
  <code>path: "/tmp/shared"</code> <br>
  in my config.yml, but it didn't work. It just adds to the default paperclip path (same with relative path like "../temp/shared"). <a href="https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/attachment.rb#L23" rel="nofollow">https://github.com/thoughtbot/paperclip/blob/master/lib/paperclip/attachment.rb#L23</a></p>
  
  <p>I also tried to to add something like <br>
  <code>Paperclip::Attachment.default_options[:path] = '/tmp/shared/:class/:id_partition/:style.:extension'</code> <br>
  to my development.rb file with no luck.</p>
  
  <p>Is it possible to set path for images in paperclip OUTSIDE the actual rails app folder?</p>
  
  <p>*MyApp uses rails 3.2, MyAppAdmin - rails 2.3.18</p>