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

Conflicts:
	server/gae/app.yaml
	server/gae/gae.py
add tcp dns to dnsproxy
add tcpover to dnsproxy
refine dnsproxy
refine dnsproxy
refine dnsproxy
refine dnsproxy
refine gae handler filters
refine urlfetch
add contributors
refine HostsFilter
Update proxy.py
new error page
Merge pull request #12 from mengzhuo/3.0

new error page
bugfix
bugfix
refine dns resolve
bugfix
refine proxy.ini
Update ntlmaps.bat