Context; add _term frontend

	modified:   lib/POEx/ZMQ3/Context.pm
'stopped' should be an emit_now

	modified:   lib/POEx/ZMQ3.pm
	modified:   lib/POEx/ZMQ3/Requestor.pm
	modified:   t/02_class/01_requestor_replier.t
Cleanups, emit vs emit_now consistency

	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
Add examples/

Still running into some weird blocking/hangs that need further examination

	new file:   examples/ping_client.pl
	new file:   examples/pong_server.pl
examples/ fucking-about

	modified:   ping_client.pl
Publish/Subscribe examples.

PUB and SUB are currently rather less buggy.

REP and REQ still have funky timing issues; a message is getting dropped
somewhere.

	new file:   examples/publish_time.pl
	new file:   examples/subscribe_time.pl