merge commits of 2012
refine CertUtil.import_ca under linux
remove httplib import
fix python 2.6 runtime error
auto import ca in MacOS/Ubuntu
refine auto import_ca under ubuntu
fix pac generate error

see error report at  Issue 7892,Issue 7892 and Issue 8177
https://code.google.com/p/goagent/issues/detail?id=7909
refine auto import_ca under MacOS
delete unused addto-keychain.sh
Merge pull request #62 from binyuj/patch-1

fix pac generate error
refine install ca failing message
Merge branch '2.0' of https://github.com/goagent/goagent into 2.0
fix auto import_ca under MacOS
rename proxy.exe to python27.exe
refine appid error message
add gbk.pyo to python27.zip
add python27.h -h for help
fix addto-startup.vbs with python27.exe
add https://github.com/phus/pybuild to startup banner
add version string/url to goagent.exe