Merge branch '3.0' of https://github.com/goagent/goagent into 3.0
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
Merge branch '3.0' of https://github.com/chencl/GoAgent into 3.0
Merge branch '3.0' of https://github.com/goagent/goagent into 3.0

Conflicts:
	server/gae/gae.py
make pylint happy
change sni name
add URLRewriteFilter
change reposne code