Check busy workers before broadcasting heartbeats.
Merge remote-tracking branch 'upstream/2-8-stable' into brian/check_your_self

Conflicts:
	lib/protobuf/rpc/servers/zmq/server.rb
Fix busy_worker_count.
Merge pull request #145 from brianstien/brian/check_your_self

Check workers before broadcasting heartbeats.
merge conf in default config of zmq server
default inproc to true