Log Message:
Update to nwdiag-0.9.2
        0.9.2 (2012-11-17)
        ------------------
        * [rackdiag] Add auto-numbering feature
        * Fix bugs

        0.9.1 (2012-10-28)
        ------------------
        * Fix bugs

        0.9.0 (2012-10-22)
        ------------------
        * Optimize algorithm for rendering shadow
        * Add options to docutils directive
        * [packetdiag] represent splitted packets with dashed-line
        * Fix bugs

        0.8.2 (2012-09-29)
        ------------------
        * Fix bugs

        0.8.1 (2012-09-08)
        ------------------
        * Add packetdiag_sphinxhelper

        0.8.0 (2012-09-06)
        ------------------
        * Add packetdiag which supports generating packet-header diaagram
        * [nwdiag] Add diagram attribute: external_connector
        * Update to new package structure (blockdiag >= 1.1.2)
        * Allow # to comment syntax
        * Fix bugs