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

Conflicts:
	server/gae/gae.py
refine relay.php
refine relay.php
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
rename path to prepare jtap porting
jtap port
refine gae relay
bugfix for jtap
typeo
add jtapi welcome page
bugfix for subdomain
revert to /2
rename _g to _gh (internal goagent handler)
refine jtapi sub_domain
refine jtapi
rename jtapi to mirror
bugfix for mirror link
refine mirror
add user script to mirror