Simplify how a message can be sent to an actor from outside an actor?

[nobeh]

Currently, to accomplish this, the user programmer needs to take a twisted way to create an instance of Envelope and then route using the available context instance. This should be simplified.

[nobeh]

An example provided in ContextTest:

    static class MyActor implements Actor {
        private static final long serialVersionUID = 1L;

        public Double doIt(Integer x) {
            return Math.random() * x;
        }
    }

    @Test
    public void tesetSendMessageOutsideActor() throws Exception {
        LocalContext context = new LocalContext();
        final MyActor actor = new MyActor();
        final Actor ref = context.newActor("myActor", actor);
        Callable<Double> message = () -> actor.doIt(10);
        Future<?> result = context.send(ref, message);
        assertNotNull(result);
        assertNotNull(result.get());
        assertEquals(Double.class, result.get().getClass());
    }