Log Message:
Update p5-CGI to 4.25.

4.25 2015-12-17

    [ DOCUMENTATION ]
    - fix link to CONTRIBUTING file (thanks to Manwar for the fix)
    - clarify that "soft" deprecation means that the HTML functions
      are deprecated but will not raise any deprecation warnings

    [ SPEC / BUG FIXES ]
    - make the list context warning only happen once per process (or
      thread) to prevent excessive log noise in long running or in
      persistent processes (thanks to @dadamail for the suggestion)

4.23 2015-12-17

    [ DOCUMENTATION ]
    - add LICENSE file and LICENSE info to Makefile.PL