Merge pull request #480 from youyong205/master

refactor
stage work
refactor AlertSummaryModule, add summary info for business alert
Merge branch 'master' of https://github.com/dianping/cat
app detail sort link
add more info
Merge pull request #482 from jialinsun/master

app detail sort link
Merge pull request #481 from leonindy/master

refactor AlertSummaryModule, add summary info for business alert
Merge branch 'master' of github.com:dianping/cat