Log Message:
Update to 0.304

Upstream changes:
0.304 Tue Jun 16 2015
    [FIXES]
    - fix RT #105177 (Slaven Rezic and Gregor Herrmann), regarding Via: header
    [TEST]
    - improvement on the fix for t/23connect.t (thanks to e477),
      but that does not seem to be enough
    - fix RT #71771 (test using HTML::Parser)