Set global logging configuration from a Paste config.

Since gunicorn.app.pasterapp.{run, paste_server} are deprecated,
there is no way to configure the logging module from a Paste config
file.
Support UNIX sockets in gaiohttp worker
Merge pull request #823 from benoitc/gaiohttp_unixsock

Support UNIX sockets in gaiohttp worker
We need at least one argument for the WSGIApplication fix #815
support tornado 4.0

fix #771
fix django ex
doc: let django user know about the DJANGO_SETTINGS_MODULE env

improve the documentation to show the usage of the DJANGO_SETTINGS_MODULE
environment variable. related to #802.
Merge pull request #809 from berkerpeksag/set-logging-paste

Set global logging configuration from a Paste config.
example: edit paste example to allow the display of gunicorn logs
Merge pull request #826 from benoitc/fix/771

support tornado 4.0
fix 19.1 changelogs
add missing people to THANKS
you probably know it but we are in 2014
Merge pull request #1 from benoitc/master

merge release 19.1