Log Message:
Update ruby-rack-test pacakge to 0.6.1.

== 0.6.1 / 2011-07-27

* Bug fixes

  * Fix support for params with arrays in multipart forms (Joel Chippindale)
  * Add respond_to? to Rack::Test::UploadedFile to match method_missing (Josh \ 
Nichols)
  * Set the Referer header on requests issued by follow_redirect! (Ryan Bigg)

== 0.6.0 / 2011-05-03

* Bug fixes

  * Add support for HTTP OPTIONS verb (Paolo "Nusco" Perrotta)
  * Call #finish on MockResponses if it's available (Aaron Patterson)
  * Allow HTTP_HOST to be set via #header (Geoff Buesing)