change Triple to AlertEntity
rename AlertEntity to AlertResultEntity
add table alert
add mail title when storing alert infos
add store alert feature for ExceptionAlert
Merge branch 'master' of https://github.com/dianping/cat
change find rule logic: find productline first, then metric item
add find-rule result event when alert tasks are running
add unimplemented method for test
Merge pull request #382 from leonindy/master

add storing alerts feature, change finding rules for metric items logic