Update ruby-sinatra to 1.4.4.

= 1.4.4 / 2013-10-21

 * Allow setting layout to false in specifically for a singe rendering engine.
   (Matt Wildig)

 * Allow using wildcard in argument passed to `request.accept?`. (wilkie)

 * Treat missing Accept header like wild card. (Patricio Mac Adden)

 * Improve tests and documentation. (Dar鱈o Javier Cravero, Armen P., michelc,
   Patricio Mac Adden, Matt Wildig, Vipul A M, utenmiki, George Timoschenko,
   Diogo Scudelletti)

 * Fix Ruby warnings. (Vipul A M, Patricio Mac Adden)

 * Improve self-hosted server started by `run!` method or in classic mode.
   (Tobias B端hlmann)

 * Reduce objects allocated per request. (Vipul A M)

 * Drop unused, undocumented options hash from Sinatra.new. (George Timoschenko)

 * Keep Content-Length header when response is a `Rack::File` or when streaming.
   (Patricio Mac Adden, George Timoschenko)

 * Use reel if it's the only server available besides webrick. (Tobias B端hlmann)

 * Add `disable :traps` so setting up signal traps for self hosted server can be
   skipped. (George Timoschenko)

 * The `status` option passed to `send_file` may now be a string. (George
   Timoschenko)

 * Reduce file size of dev mode images for 404 and 500 pages. (Francis Go)


(obache)