Log Message:
Update ruby-sinatra to 1.3.3.

= 1.3.3 / 2012-08-19

 * Improved documentation. (burningTyger, Konstantin Haase, Gabriel Andretta,
   Anurag Priyam, michelc)

 * No longer modify the load path. (Konstantin Haase)

 * When keeping a stream open, set up callback/errback correctly to deal with
   clients closing the connection. (Konstantin Haase)

 * Fix bug where having a query param and a URL param by the same name would
   concatinate the two values. (Konstantin Haase)

 * Prevent douplicated log output when application is already wrapped in a
   `Rack::CommonLogger`. (Konstantin Haase)

 * Fix issue where `Rack::Link` and Rails were preventing indefinite streaming.
   (Konstantin Haase)

 * No longer cause warnings when running Ruby with `-w`. (Konstantin Haase)

 * HEAD requests on static files no longer report a Content-Length of 0, but
   instead the proper length. (Konstantin Haase)

 * When protecting against CSRF attacks, drop the session instead of refusing
   the request. (Konstantin Haase)