title: unicorn folder for pid is not writable
body: <p>I'm using capistrano and now want to start using unicorn on my server, so I have this in my deploy.rb:</p>
  
  <pre><code>set :linked_dirs, fetch(:linked_dirs, []).push('/home/webadmin/www/my_app/shared/pids', '/home/webadmin/www/my_app/current/config', '/home/webadmin/www/my_app/shared/sockets')
  
  set :unicorn_conf, "/home/webadmin/www/my_app/current/config/unicorn.rb"
  set :unicorn_pid, "/home/webadmin/www/my_app/shared/pids/unicorn.pid"
  </code></pre>
  
  <p>now when I'm deploying to server I have this error:</p>
  
  <pre><code> /home/webadmin/www/my_app/shared/bundle/ruby/1.9.1/gems/unicorn-4.9.0/lib/unicorn/configurator.rb:91:in `block in reload'
  
   directory for pid=/www/my_app/shared/pids/unicorn.pid not writable
   (
   ArgumentError
   )
  </code></pre>
  
  <p>I have this folder on server and granted permissions to it via <code>chmod go-w</code> but still have this error</p>