Update to 1.92

Upstream changes:
1.92    2014-04-12
    - Add scripts/tag-release.pl .

1.91    2014-04-12
    - t/cpan-changes.t : minimum version of Test::CPAN::Changes.
        - This is to avoid test failures such as:
            - http://www.cpantesters.org/cpan/report/5af7d5eb-6bfa-1014-b84e-eb85912f2992

1.90    2014-04-10
    - Handle $Config{dlext} correctly on Windows.
        - https://rt.cpan.org/Ticket/Display.html?id=94516
        - Thanks to kmx for the report and fix.
    - Add t/pod.t .
        - Fix some POD problems.
    - Add t/cpan-changes.t and convert Changes to CPAN::Changes format.
    - Add t/style-trailing-space.t.
        - Remove trailing whitespace.

1.89    2014-03-05
    - Fix memory management of node-sets returned from extension functions.
      Without calling xsltExtensionInstructionResultRegister, node-sets
      could be freed too early, leading to strange errors or segfaults.
        - https://bugzilla.gnome.org/show_bug.cgi?id=562302
        - https://rt.cpan.org/Ticket/Display.html?id=93349
        - Thanks to Alexander Schepanovski for the report.
    - Document input_callbacks methods
    - Don't register libxml2 input callbacks twice
        - https://rt.cpan.org/Public/Bug/Display.html?id=60313
    - Fix memory leak with extension functions returning node lists
        - https://rt.cpan.org/Public/Bug/Display.html?id=55623
        - https://rt.cpan.org/Public/Bug/Display.html?id=76596
        - Thanks to Jozef Kutej and Slaven Rezic for the reports.
    - Thanks to Nick Wellnhofer for the pull requests and fixes.

1.88    2014-02-17
    - Fix t/xml-grammar-failures.t based on the xml:space commentary here:
        - https://mail.gnome.org/archives/xml/2014-February/msg00000.html
        - Caused some failures which were ultimately our fault.

1.87    2014-02-03
    - Decrease the minimum libxslt version again.
        - Setting it as 1.1.28 did not fix the failures, and now we have
        some more tests to test against it.
        - https://rt.cpan.org/Ticket/Display.html?id=92659
        - Thanks to Slaven Rezic for the report.

1.86    2014-02-02
    - Add t/xml-grammar-failures.t to catch test failures in dependent modules.
        - Add some data files for it under t/data/*.
        - This fails on FreeBSD 9.2 currently.

1.85    2014-02-01
    - Add "use strict;" and "use warnings;" globally (CPANTS).
    - Add LICENSE to the MANIFEST.

1.84    2013-12-26
    - Hopefully fix a segmentation fault on Win32 introduced in the last ver.
        - https://rt.cpan.org/Ticket/Display.html?id=91652
        - Thanks to Alexandr Ciornii for the report, and to Nikolay Sivov
        for providing help.

1.83    2013-12-22
    - Get rid of compiler warnings when compiling using CLANG.
        - https://rt.cpan.org/Public/Bug/Display.html?id=91118
        - Thanks to Daniel Macks for the report.

(wen)