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
python2 is not installed by default
Update addto-startup.py
add handle_urlfetch_response_close
refine urlfetch cache sock
bugfix for urlfetch cache sock
move handle_urlfetch_response_close to AdvancedProxyHandler
add [gae]keepalive option
Merge remote-tracking branch 'goagent/3.0' into 3.0

Conflicts:
	local/proxy.py

Signed-off-by: wwqgtxx <wwqgtxx@gmail.com>