Null vars: Release proxies

app.js

var navigator = require ('ui/navigator').createNavigator(),
	 mainWindow = require('ui/mainWindow').mainWindow();
	 
navigator.open( mainWindow );

setTimeout(function(){
	navigator.close(mainWindow);
	//mainWindow = null;
	//navigator = null;
}, 15000);

mainWindow.js

var stats = {
	Architecture : Ti.Platform.architecture,
	AvailableMemory : Ti.Platform.availableMemory,
	Locale : Ti.Platform.locale,
	Model : Ti.Platform.model,
	OSName : Ti.Platform.name,
	OSName1 : Ti.Platform.osname,
	OSType : Ti.Platform.ostype,
	ProcessorCount : Ti.Platform.processorCount,
	Version : Ti.Platform.version,
	DisplayDensity : Ti.Platform.displayCaps.density,
	DisplayDpi : Ti.Platform.displayCaps.dpi,
	DisplayPlatformHeight : Ti.Platform.displayCaps.platformHeight,
	DisplayPlatformWidth : Ti.Platform.displayCaps.platformWidth,
	TitaniumRuntime : Ti.Platform.runtime
};


var mainWindow = function(params){
	var window = Ti.UI.createWindow({
		backgroundColor: 'red',
		id: 'mainWindow'
	});
	
	window.add(
		Ti.UI.createLabel({
			text: stats
		})
	);
	
	window.addEventListener('close', function(){
		Ti.API.info('Close event');
	});
	
	return window;
};

exports.mainWindow = mainWindow;