Merge branch '3.0' of https://github.com/goagent/goagent into 3.0
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
use tls default
bugfix for mock 500/502/503
refine crypt cert handling
bugfix: no response body for HEAD, status 204, 304
Merge pull request #8 from v3aqb/patch-3

bug fix: no response body for HEAD, status 204, 304
Merge branch '3.0' of https://github.com/goagent/goagent into 3.0
bugfix
bugfix for dns servers
refine create_tcp_connection
add handle_urlfetch_error
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