[TIMOB-13531] Remove child views

Test code:
```
var win = Ti.UI.createWindow({
	layout: 'vertical'
});


var btn = Ti.UI.createButton({
    top:10,
    title: 'Button'
});

win.add(btn);

var view = Ti.UI.createView({
	top: 10,
	width: 100,
	height: 100,
	backgroundColor: 'green'
});

win.add(view);

var red = Ti.UI.createView({
	backgroundColor: 'red',
	width: 100,
	height: 100,
	top: 10
});
win.add(red);
btn.addEventListener('click', function(e){
    win.remove(btn);
    win.remove(view);
});
win.open();
```