handle RPC error
Merge branch 'master' of https://github.com/chenyf/push

Conflicts:
	comet/server.go
handle errors returned by control()
check if device is online
support notification
Merge pull request #17 from gooo000/master

update notifyapi config
Merge branch 'master' of https://github.com/chenyf/push
rename sso_tk to token
change MQ RPC from fanout to direct
add the API to check online devices
Merge pull request #18 from zhengzhiren/master

merge
up
Merge branch 'master' of github.com:chenyf/push
up
add sign check for pushapi
add get_topics
add: get_topics
sign from HTTP header
Sign
sign test
sign & unit test
Merge pull request #19 from zhengzhiren/master

merge sign