pypy plugin for uWSGI

For official documentation check: https://uwsgi-docs.readthedocs.org/en/latest/

For commercial support check: http://unbit.com/

To ease the plugin configuration, some paths have been set up in the package.
The plugin requires the following Debian specific uwsgi configuration.

    [uwsgi]
    plugin = pypy3
    pypy-lib = /usr/lib/uwsgi/plugins/pypy/libpypy3-c.so
    pypy-home = /usr/lib/uwsgi/plugins/pypy/home
    pypy-setup = /usr/lib/uwsgi/plugins/pypy/pypy_setup.py