modify the decorator
modify the builder
Merge pull request #675 from youyong205/master

fix bug
Merge pull request #674 from leonindy/master

refactor heartbeat history part
tune problem report model
add
update test case in consumer
Merge pull request #676 from jialinsun/master

	tune problem report model
add disk and extension infos for heartbeat history module
Merge branch 'master' of github.com:dianping/cat