Update to 3.48

Upstream changes:
3.48 - 2014-03-30 - minor maintenance release

- fixed tests

3.47 - 2014-03-27 - minor maintenance release

- fixed: missing entities when parsing HTML
  RT #93604 https://rt.cpan.org/Public/Bug/Display.html?id=93604

- fixed: tests failed when using a version of HTML::TreeBuilder with a non-numeric version

- fixed in twig_handlers, '=' in regexps on attributes are turned into 'eq'
  RT #94295 https://rt.cpan.org/Public/Bug/Display.html?id=94295

3.46 - 2014-03-05 - minor maintenance release

- fixed: test failed on Windows

3.45 - 2014-02-27 - minor maintenance release

- fixed: link to idented_a format description
  RT #85400 https://rt.cpan.org/Public/Bug/Display.html?id=85400
  fixed by Martin McGrath

- fixed: code that gave a warning in 5.19.9

- fixed: RT #86651 https://rt.cpan.org/Ticket/Display.html?id=86773
  xml_pp, quote not escaped in attribute values

- fixed various typos in docs RT#87660
  thanks to David Steinbrunner

- fixed: RT #86773 https://rt.cpan.org/Ticket/Display.html?id=86773
  CDATA sections in HTML were not properly escaped when using the
  (default) HTML::TreeBuilder conversion
  spotted by Marco Pessotto

- fixed: RT #85933 https://rt.cpan.org/Ticket/Display.html?id=85933
  quotes in attributes were not properly escaped
  dpotted by Arun Lakhana

- added: docs for tools and safe_print_to_file

- added: support for XPath variables
  thanks to Nathan Glenn for the initial implementation

- updated: Changes to conform to CPAN::Changes + test


(wen)