[TIMOB-2191] Android: Add View support to AlertDialog

Add support for property 'androidView' as a platform specific option for AlertDialog. Note in the example I added a second invisible view to force the size of the message container. It's a side-effect of view as a top-most container.

var win = Ti.UI.createWindow({ backgroundColor : 'white'});
var btn = Ti.UI.createButton({
    title : 'Open Dialog'
});

btn.addEventListener('click', function(e) {
    var dialog = null;
    var view = Ti.UI.createView({
        backgroundColor : 'red',
        width : 200,
        height : 200
    });
    
    var v2 = Ti.UI.createView({
        wrap : false,
        width : 300,
        height : 300
    });
    view.add(v2);
    
    var viewBtn = Ti.UI.createButton({
        title : 'Click Me',
        width : 200,
        height : 200
    });
    view.add(viewBtn);
    
    viewBtn.addEventListener('click', function(e) {
        dialog.hide();
    });

    dialog = Titanium.UI.createAlertDialog({
        buttonNames : ['Cancel'],
        title:'I am a title',
            androidView : view
    }); 

    dialog.addEventListener('click', function(e) {
        Ti.API.error("CLICK - ID: " + e.index + " cancel: " + e.cancel + " button: " + e.button);
    });
    
    dialog.show();
});
win.add(btn);
win.open({animated:false});