Have a simple demo app to show whether port 8810 is open on the superbox

Hi Dimitri,

Please try this demo app on your computer by:

     $ cd <into your paypal-ipn-forwarder project>
     $ source .rvmrc
     $ git remote add scott git@github.com:oldfartdeveloper/paypal-ipn-forwarder.git
     $ git pull scott demo
     $ bundle install
     $ rackup -p 8810

The little Sinatra app should launch.  Then browse localhost:8810, and you should see "hello world"

If this works, then you can do the following:

1.  Merge this pull request.
1.  `ssh` into the superbox. (hint: you can use the `sb` alias we used earlier.)
1.  `cd work`
1.  Repeat the steps above except that this time you browse [http://superbox.hedgeye.com:8810](http://superbox.hedgeye.com:8810).