extra-paths option stopped working

Hi there,

In the recent releases of buildout.recipe.uwsgi `extra-paths` and `pythonpath` options are silently ignored which results in err... funny behaviour of previously perfectly good buildouts.

I understand that the code was removed to make the recipe work with the new version of zc.buildout - instead of relying on now missing method call from zc.buildout I'm simply iterating over whatever get_extra_paths() returns and adding <pythonpath /> lines to the config. Which may not be exactly the same as using the now missing method from zc.buildout but seems to do the trick.

Additionally, I removed mentions of AUTHORS.rst and CHANGELOG.rst from Manifest.in - those were producing warning messages.