Safer stop methods for components.

	modified:   Changes
	modified:   lib/POEx/ZMQ3/Publisher.pm
	modified:   lib/POEx/ZMQ3/Replier.pm
	modified:   lib/POEx/ZMQ3/Requestor.pm
	modified:   lib/POEx/ZMQ3/Role/Sockets.pm
	modified:   lib/POEx/ZMQ3/Subscriber.pm