Log Message:
Update ruby-httpclient to 2.2.5.

= Changes in 2.2.5 =

  May 06, 2012 - version 2.2.5

    * Bug fixes

      * Added Magic encoding comment to hexdump.rb to avoid encoding error.
      * Add workaround for JRuby issue on Windows (JRUBY-6136)
	On Windows, calling File#size fails with an Unknown error (20047).
	This workaround uses File#lstat instead.
      * Require open-uri only on ruby 1.9, since it is not needed on 1.8.

    * Features

      * Allow symbol Header name for HTTP request.
      * Dump more SSL certificate information under $DEBUG.
      * Add HTTPClient::SSLConfig#ssl_version property.
      * Add 'Accept: */*' header to request by default. Rails requies it.
	It doesn't override given Accept header from API.
      * Add HTTPClient::SSLConfig#set_default_paths. This method makes
	HTTPClient instance to use OpenSSL's default trusted CA certificates.
      * Allow to set Date header manually.
	ex. clent.get(uri, :header => {'Date' => Time.now.httpdate})