set ForwardedAllowIPS via cli
Run worker's setup early than set num_workers

`cfg.worker_class` is a property, which calls the classmethod `setup` of
the worker class when accessed.  Gevent worker relies on this mechanism
to call `gevent.monkey.patch_all()`.

However, `num_workers` is a hooked property, when it is set, gunicorn
will call hook defined by user.  If the hooked code relies on
gevent's monkey patch, it will fail because the monkey patch has not
been applied yet.

This commit makes sure that `worker_class` property getter invokes
before `num_workers` setter to resolve this problem.
Use lowercase 'true' in example config to be consistent
Fix missing errno import for eventlet sendfile patch
Merge pull request #658 from olt/master

Fix missing errno import for eventlet sendfile patch
merge duplicate EventletWorker.init_process method (fixes #657)
Reinit Hub when using old version of gevent.

fix #654
Merge pull request #653 from alasdairnicol/patch-1

Use lowercase 'true' in example config to be consistent
Merge pull request #659 from olt/fix/657

merge duplicate EventletWorker.init_process method (fixes #657)
fix doc

fix #656
improve systemd conf
deprecate the paste command.
bump to gunicorn 18.2
django run_command: remove addr once parsed.

fix #577
fix examples/nginx.conf
make banner h1 text easier to read
Split access_log_format specifiers description into multiply lines
Correct sphinx-build error: source/settings.rst:762: ERROR: Inconsistent literal block quoting.
proxy_allow_ips: Allow proxy protocol if "*" specified.

This makes proxy_allow_ips symmetrical with forwarded_allow_ips and is
useful in the same situations.
Fixed the request line length check.
Merge pull request #665 from askedrelic/feature/tweak-banner-readability

Make frontpage banner text easier to read