fix #785: handle binary type address given to a client socket address
Update custom application example.

It's running on both Python 2 and 3 now.
add latest fix to changes.

note: it should come with the commit ...
Change the rest of QUIT and TERM signals.

This will restore graceful shutdown of workers by master.
Also worker_int callback is moved from handle_exit (INT and TERM before switching) to handle_quit(INT and QUIT).
Merge pull request #786 from zeezooz/fix_signals

Change the rest of QUIT and TERM signals.
bump to 19.1
add the change to the news
Add multithread information to the design docs

Relates to #784
Add thundering herd question to FAQ

Close #784
fix #783 fix tornado worker with missing option

Gunicorn doesn't ovveride the WSGI headers with the X heaaders anymore.
update news
fix #783 : link to the corresponding discussion in the changelog
fix #787 check if we load a pyc file or not.
this example shouldn't have been comitted.
check the python requirements for the gaiohttp server

fix #788
Revert "check the python requirements for the gaiohttp server"

This reverts commit 4ac7e55161553503817dfbd01ccc5f263d163e69.
StopIteration shouldn't be catched at this level.

fix #790
Fixed spelling mistake

fixed spelling in TTOU description
Merge pull request #794 from rhyspowell/patch-1

Fixed spelling mistake
Fix a markup error in news.rst.

This commit also silences a couple of Sphinx warnings e.g.

    WARNING: Bullet list ends without a blank line;
    unexpected unindent.