bugfix
add appspot.com
bugfix for gtalk
support multiple hosts address
Update proxy.py
update goagent
update goagent
delay trigger pac update
fix pac autoupdate
refine request headers
fix pac dir error issue
Merge pull request #147 from binyuj/patch-1

fix pac dir error issue
Merge branch '3.0' of github.com:goagent/goagent into 3.0