Log Message:
Update to 2.4

Upstream ChangLog:
2.4 2012-07-20
    - Fixed RT #13791, which meant you couldn't request http://foobar.com --
      had to have to trailing slash on the URL.
    - Don't add request header if value passed is undef (RT #4546).
    - Fixed bug where writing the request can get stuck in a loop.
      Bug reported by Florian Kirchmeir. Fix based on Florian's patch.
    - RT #35360 fixed (fix included in report).
    - Documentation tidy-up
    - Neil Bowers (NEILB) granted co-maint by Adam (thanks)