Log Message:
Update ruby-net-http-digest_auth to 1.4.

=== 1.4 / 2013-07-23

* Minor enhancements
  * Relaxed parser to accept quoted algorithm to work with Linksys SPA922.
    Pull request #8 by Ismail Hanli, Issue #5 by bearded

=== 1.3 / 2012-03-28

* Minor enhancements
  * The cnonce is regenerated for every request to improve security.
  * SecureRandom is used to generate the cnonce instead of Kernel#rand
* Bug fix
  * cnonce and nonce-count are no longer sent when qop was not provided per
    RFC 2617 section 3.2.2.