wsgi: Gunicorn => Chaussette

plaintext: 21k req/sec => 114k req/sec
wsgi: reduce processes.
flask: json: 5k => 7k req/sec
Add circus to requirements.
Add missing file.
flask: Update benchmark_config
flask-py3: Remove gunicorn.
flask-pypy: Remove gunicorn.
Add missing file.
mv
updating language
895 all changes work

Works straight out the box, had to install circus manually,
however in future installations that will be taken
care of by the install script.
Merge branch '895'
Revert "flask-pypy: Remove gunicorn."

This reverts commit c2fe5ff786544a0ede3dd785fecdacd209c49640.
Remove server-tornado.
Remove "gunicorn" from benchmark_config
Revert "Revert "Merge branch 'tornado-postgres' of https://github.com/maticz/FrameworkBenchmarks into 671""

This reverts commit 99dcab20cb6d1be17eb40d3e5cb55344f2e6cc45.

Conflicts:
	toolset/setup/linux/installer.py
	tornado/server.py
Merge branch 'revert-pypy-gunicorn' of http://github.com/methane/FrameworkBenchmarks into 896
bump to Ninja 3.2.0
Merge remote-tracking branch 'upstream/master'