Log Message:
Update to 2.0100

Upstream changes:
2.0100          Wed 14 Aug 08:23:53 IDT 2013
    - Added the unique_key() method to XML::LibXML::Node.
    - t/40reader.t: assigning from $@ to a lexical so it won't be
    over-ridden.
        - https://rt.cpan.org/Ticket/Display.html?id=87830
        - Thanks to Douglas Christopher Wilson for the report.