modernize 0.2

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This library is a very thin wrapper around lib2to3 to utilize it
to make Python 2 code more modern with the intention of eventually
porting it over to Python 3.

It does not guarantee, but it attempts to spit out a Python 2/3
compatible codebase.  The code that it generates has a runtime
dependency on `six`.

Unicode Literal Control:

  - By default modernize will wrap literals with the six helpers.
    This is useful if you want to support Python 3.1 and Python 3.2
    without bigger changes.
  - Alternatively there is the ``--compat-unicode`` flag which
    does not change unicode literals at all which means that you
    can take advantage of PEP 414.
  - The last alternative is the ``--future-unicode`` flag which
    imports the ``unicode_literals`` from the ``__future__`` module.
    This requires Python 2.6 and later and will require that you
    mark bytestrings with ``b''`` and native strings in ``str(b'')``
    or something similar that survives the transformation.