stage current work
Merge pull request #514 from youyong205/master

refator code
before pull
Merge branch 'master' of https://github.com/dianping/cat
refactor ftl
Merge branch 'master' of https://github.com/dianping/cat
Merge pull request #515 from leonindy/master

refactor rule ftl
before pull
before pull
milestone for alert interface
fix some issue
Merge pull request #516 from jialinsun/master

milestone for alert interface