Add a channel event handler sample based on block events.
Scope:
create a block event handler
write events received to the console
write events received to a log file
write events to an off chain couchdb database
demonstrate a basic map reduce view for aggregation
Change-Id: I5420ddc7070dbee785218ce5960f7604ac799f90
Signed-off-by: Chris Elder <chris.elder@us.ibm.com>
