PAC: fill the server address with serving address

When usable. Rather than "listening ip".
'Cause when multiple network cards are used, "listening ip" can be wrong.
Merge pull request #20 from zwhfly/3.0

PAC: fill the server address with serving address
refine pagespeed
refine pagespeed
bugfix for pagespeed
improve dns resolve
bump version to 3.1.18
refine proxy.pac
add more iplist
refine ipv6
add .gstatic.com to fakehttps
refine proxy.py
disable google_cn
refine proxy.ini
refine dns resolve
fix google tasks
add is_google_ip
decrease window
make pylint happy
change sni name