Merge pull request #348 from youyong205/master

merge exception function
修复exception alert bug，重构代码。忽略Agent部分修改
Merge branch 'master' of https://github.com/dianping/cat
clean code
clean log code
Merge pull request #349 from jialinsun/master

修复exception alert bug，重构代码。网络展示界面微调。agent重构。
Merge branch 'master' of github.com:dianping/cat
cat client support status extension
netgraphbuilder task inject bug fix
Merge pull request #350 from zengwei0771/master

netgraphbuilder task inject bug fix
modify the agent
Merge branch 'master' of github.com:dianping/cat
Merge branch 'master' of code.dianpingoa.com:arch/cat