Add --reload option for code reloading

Fix #526
Add note about paste and preload for reloader
Merge pull request #682 from tilgovi/feature/526

Add --reload option for code reloading
fix python3 support
Use a dynamic timeout to wait for the optimal time.
Merge pull request #687 from benoitc/feature/no_active_idle-2

Feature/no active idle 2
Add documentation for nginx X-Forwarded-*

Fix #571
Documentation formatting
Regenerate settings.rst
Clarify secure scheme header warning in deploy doc

Gunicorn doesn't restrict the X-Forwarded-For header, only the
scheme header.
Update settings.rst

Gevent version should be 0.13 at least, since Gunicorn needs the gevent.server support (also see: http://blog.gevent.org/2010/07/14/gevent-0-13-0-released/)
Invalid user supplied messages should be escaped HTML entity escaped.
Merge pull request #689 from rikva/patch-1

Update settings.rst
fix typo in logging.conf example
fixes issue #691, raw_env config file parsing
Merge pull request #692 from xealot/691-raw_env-fix

fixes issue #691, raw_env config file parsing
Removed the <p> tag from the base file and added it to the template
Merge pull request #690 from levigross/master

Invalid user supplied messages should be HTML entity escaped.
Fix a typo.

environement -> environment
Merge pull request #699 from berkerpeksag/patch-1

Fix a typo.