Merge pull request #470 from youyong205/master

refactor document
Merge pull request #471 from youyong205/master

refator code
Merge pull request #472 from youyong205/master

refactor domain name
add more pages for alert doc
resolve conflicts, rename frontEndException
Merge pull request #473 from leonindy/master

add more pages for alert doc
modify the sql
Merge branch 'master' of github.com:dianping/cat
refactor