fix: Fix onSizeChange

[alexanderGugel]

onSizeChange hasn't been called.

Fixes #476

Example

'use strict';

var DOMElement = require('famous/dom-renderables/DOMElement');
var FamousEngine = require('famous/core/FamousEngine');

FamousEngine.init();

var node = FamousEngine.createScene().addChild();

var el = new DOMElement(node, {
    content: 'Hello',
    properties: {
        background: 'red',
        fontSize: '30px'
    }
});

node
    .setSizeMode('render', 'render')
    .setAlign(0.5, 0.5)
    .setMountPoint(0.5, 0.5)
    .setOrigin(0.5, 0.5);

var spinner = node.addComponent({
    onUpdate: function(time) {
        node.setRotation(0, time / 1000, 0);
        node.requestUpdateOnNextTick(spinner);
    },
    onSizeChange: function (x, y, z) {
        console.log(x, y, z);
    }
});

setTimeout(function () {
    el.setContent('A');
}, 1000);

node.requestUpdate(spinner);

@michaelobriena