0.3.1 
    Escape ``{}`` in regular expressions (to ``\{\}``), since it
    fails with Python 2.4.
    Escape text but not attributes in nodes.

0.3 (2007-06-20 20:24:22 BRT)
    Fixed a bug when the replacement string has a shrubbery tag.
    Depending on the order a recursive replacement would occur.
