This is just a demo project for a StackOverflow question, to demonstrate an
issue I have with making asynchronous calls to outside the application.  For
a more detailed explanation, please see the question:

http://stackoverflow.com/questions/6688985/async-sinatra-in-rails-async-actions-cant-write-to-shared-session

to run this app, use Thin:

rails server thin

pages of interest:
localhost/  #Rails
localhost/sinatra/local  #Sinatra
localhost/sinatra/goog   #Sinatra sending an Asynchronous request to Google