[AC-5287] Ti.Map: iOS crash when hiding/showing notifications after selecting annotation

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libobjc.A.dylib               	0x2240867a objc_retain + 10
1   MapKit                        	0x2bec9776 -[MKAnnotationManager dequeueReusableAnnotationRepresentationWithIdentifier:] + 110
2   test_map                      	0x004ce500 0x102000 + 3982592
3   MapKit                        	0x2bf03314 -[MKMapView annotationManager:representationForAnnotation:] + 336
4   MapKit                        	0x2bec93a8 -[MKAnnotationManager _addRepresentationForAnnotation:] + 340
5   MapKit                        	0x2bec7f9a -[MKAnnotationManager updateVisibleAnnotations] + 1190
6   Foundation                    	0x2347e654 __NSFireTimer + 64
7   CoreFoundation                	0x22c1658e __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 14
8   CoreFoundation                	0x22c161c0 __CFRunLoopDoTimer + 936
9   CoreFoundation                	0x22c1400c __CFRunLoopRun + 1484
10  CoreFoundation                	0x22b63228 CFRunLoopRunSpecific + 520
11  CoreFoundation                	0x22b63014 CFRunLoopRunInMode + 108
12  GraphicsServices              	0x24153ac8 GSEventRunModal + 160
13  UIKit                         	0x27237188 UIApplicationMain + 144
14  test_map                      	0x00108c40 0x102000 + 27712
15  libdyld.dylib                 	0x2280b872 start + 2

var Map = require('ti.map');
var win = Titanium.UI.createWindow();
var ar = [];

for (var i = 0; i < 20; ++i) {
	var mountainView = Map.createAnnotation({
		latitude: 37 + (Math.random() * 5),
		longitude: -122 + (Math.random() * 5),
		title: "Appcelerator Headquarters",
		subtitle: 'Mountain View, CA',
		pincolor: Map.ANNOTATION_RED,
	});
	ar.push(mountainView);
}

var mapview = Map.createView({
	mapType: Map.NORMAL_TYPE,
	region: {
		latitude: 37.3,
		longitude: -122.3,
		latitudeDelta: 0.5,
		longitudeDelta: 0.5
	},
	animate: true,
	regionFit: true,
	userLocation: true
});

mapview.setAnnotations(ar);

var btn1 = Ti.UI.createButton({
	title: "switch",
	bottom: 10
});

btn1.addEventListener("click", function(e) {
	mapview.removeAllAnnotations();
	setTimeout(function() {
		mapview.setAnnotations(ar);
	}, 1000);
});
win.add(mapview);
win.add(btn1);
win.open();