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Import the latest changes from Pyramid

This is a wholesale copy of the latest changes from Pyramid in
anticipation of removing this from Pyramid entirely.

Signed-off-by: Bert JW Regeer <bertjw@regeer.org>
Copy the latest tests from Pyramid for Mako
Cleanup setup.py a little
Set up entry point for our mako renderer

This points to the includeme() function that expects a config variable
passed in to it.
Merge pull request #2 from bertjwregeer/feature/split_mako_from_pyramid

Feature: split mako from pyramid