Log Message:
Update py-flask-flatpages to 0.6.

Version 0.6
~~~~~~~~~~~

Released on 2015-02-09

* Python 3 support.
* Allow multiple file extensions for FlatPages.
* The renderer function now optionally takes a third argument, namely
  the :class:`Page` instance.
* It is now possible to instantiate multiple instances of :class:`FlatPages`
  with different configurations. This is done by specifying an additional
  parameter ``name`` to the initializer and adding the same name in uppercase
  to the respective Flask configuration settings.