Update py-blockdiag to 1.1.4.

        1.1.4 (2012-03-15)
        ------------------
        * Add new edge.hstyles: oneone, onemany, manyone, manymany
        * Add edge attribute: description (for build description-tables)
        * Fix bugs

        1.1.3 (2012-02-13)
        ------------------
        * Add new edge type for data-models (thanks to David Lang)
        * Add --no-transparency option
        * Fix bugs

(obache)