tests for Connector, Listener, Role::Connector

... slowly fixing the test coverage situation ...

	new file:   t/backend/connect.t
	new file:   t/backend/connector.t
	new file:   t/backend/listener.t
	new file:   t/backend/role/connector.t
Connect; probably OK to have ro 'idle', not using rwp currently

	modified:   lib/POEx/IRC/Backend/Connect.pm
test expansion

	modified:   t/backend.t
	modified:   t/backend/connect.t
HasWheel->wheel_id should have a builder

	modified:   lib/POEx/IRC/Backend/Role/HasWheel.pm