Fixed Furexample, NullWuObject now counts up value to force value to propagate
Fixed testrtt to return to WAIT_ACK when received a CAN message
Removed and clean group.c and group.h
Rename and separate handling failure from sending heartbeat
Added functions to add and remove endpoints from component
Merge branch 'develop' of github.com:wukong-m2m/NanoKong into develop