add period to AppRoll, RollID, streamId; add getLocalHost() getRemoteHost() getRollTs() getClosestRollTs(); add onConnected() to node; add collectorNodes, appNodes to supervisor, remove hostMap
Merge pull request #31 from ErikFang/master

add period to AppRoll, RollID, streamId; add getLocalHost() getRemoteHos...
Merge pull request #14 from dianping/master

from dianping to jin
add zkhelper and its UT
review recovery strategy, ready for demo
Merge pull request #32 from ErikFang/master

review recovery strategy, ready for demo
Merge pull request #15 from dianping/master

from dianping to jin
merge