move debian/* from 2.0 and improve .gitignore
patches for logging
HH-28175 force curls to make fresh connections every time
HH-35189 set header length cap to a more appropriate value

Conflicts:
	tornado/web.py
HH-40589 fail-proof headers decoding
HH-46051 fix bug in SimpleCookie
Merge remote-tracking branch 'origin/HH-41232' into release-candidate