0.1     -- Initial release
0.2     -- Added Python 3 support
0.2.1   -- Modified TreeWalk to add '_name' suffix for
           functions that work on attribute names
0.3     -- Added support for Python 3.3. Added YieldFrom and
           updated Try and With. Also, fixed a packaging bug
           on Python 3. See pull requests #1 and #2 for more
           information.
0.4     -- Added a visitor for NameConstant.
           Added initial test suite and documentation.
0.4.1   -- Added missing SourceGenerator.visit_arguments()
0.5     -- Added support for Python 3.5 infix matrix
           multiplication
