Update py-flask-frozen to 0.10.

Version 0.10
~~~~~~~~~~~~

Released on 2013-03-11.

* Add the ``FREEZER_DESTINATION_IGNORE`` configuration
  (Thanks to Jim Gray and Christopher Roach.)
* Add the ``FREEZER_RELATIVE_URLS`` configuration
* Add the :func:`relative_url_for` function.
Updated www/py-flask-frozen to 0.10.
Change in LICENSE