Log Message:
Update ruby-libxml to 2.5.0.

= Release History

== 2.5.0 / 2013-01-27 Charlie Savage

* Compatibility with older versions for IO::write (rb_io_bufwrite is specific
  to ruby >= 1.9.3?)
  and symbols are VALUE not ID (julp).
* Fix version for xmlTextWriterSetQuoteChar, it appeared in libxml2 2.9.0, last
  version (julp)
* Update use of LIBXML_VERSION (julp).
* Fix misuse of rb_scan_args (julp).
* Update documentation, including DTD docs and added XML Writer (julp).
* Added a new XML::Writer class (julp).
* Improved xml reader api and add namespace support.  Note that passing a
  numeric value to XML::Reader::move_to_attribute has been deprecated. Instead
  you should now use #move_to_attribute_no.  (julp).
* Improve error handling and messages (Jarl Friis)