modify scheduledManager
Merge branch 'master' of https://github.com/dianping/cat
clean code
modfiy
clean code
Merge pull request #586 from jialinsun/master

modify scheduledManager
Merge pull request #585 from leonindy/master

fix a bug about getting null machine in HeartBeatAlert
disable default exception config
Merge pull request #587 from leonindy/master

change alteration period to 30 minutes when generating summary message
Merge branch 'master' of https://github.com/dianping/cat
Merge pull request #588 from jialinsun/master

disable default exception config
add backend of high load sql module
add new table highload_sql
fix serval bugs in HighLoadSqlUpdater
add highload page
refactor highroad module, which makes expand easier
add HighloadSqlUpdater
refact frontend modules of highload module
Merge branch 'master' of https://github.com/dianping/cat
add compare feature for fronted of highload module