add null check in handleCollectorNodeFail
close realtime stream when appnode and collectornode disconnected
log exception in Node.loopInternal()
let appnode handle unrecoverable roll
add UNRECOVERABLE,MANUAL_RECOVERY_ROLL,DUMPSTAT,RETIRESTREAM message, add cli
Merge pull request #39 from ErikFang/master

add new message
add encoder in LogTailerListener.java to fix tailer's garbled characters problem
Merge pull request #40 from ErikFang/master

add encoder in LogTailerListener.java to fix tailer's garbled characters...
Merge pull request #19 from dianping/master

from dianping to jin