Code integration of consumer
Merge pull request #61 from ErikFang/realtime

add GenClient
merge
refact a new consumer with GenClient
Optimize data structure and code
Some additional fix and optimization after review
remove atomicref
remove consumer.properties
Merge pull request #60 from LantaoJin/realtime

Code integration of consumer
Merge pull request #12 from dianping/realtime

sync