[MapView] Support for annotation callouts, annotation press, callout presses and pin animation

Summary:
Started from here - https://github.com/facebook/react-native/issues/1120. Most functionality for annotations were missing so I started implementing and somehow got caught up until the entire thing was done.

![screen shot 2015-05-12 at 10 07 43 pm](https://cloud.githubusercontent.com/assets/688326/7588677/8479a7a4-f8f9-11e4-99a4-1dc3c7691810.png)

2 new events:
- callout presses (left / right)
- annotation presses

6 new properties for annotations:
- hasLeftCallout
- hasRightCallout
- onLeftCalloutPress
- onRightCalloutPress
- animateDrop
- id

1 new property for MapView
- onAnnotationPress

---
Now the important thing is, that I implemented all of this the way "I would do it". I am not sure this is the 'reacty' way so please let me know my mistakes 😄

The problem is that there is no real way to identify annotations which makes it difficult to distinguish which one got clicked. The idea is to pass a `id` and whether it has callouts the entire way with the annotation. I had to
Closes https://github.com/facebook/react-native/pull/1247
Github Author: David Mohl <me@dave.cx>

Test Plan: Imported from GitHub, without a `Test Plan:` line.

React/Views/RCTMapManager.m

@@ -15,6 +15,9 @@
 #import "RCTEventDispatcher.h"
 #import "RCTMap.h"
 #import "UIView+React.h"
+#import "RCTPointAnnotation.h"
+
+#import <MapKit/MapKit.h>
 
 static NSString *const RCTMapViewKey = @"MapView";
 
@@ -42,7 +45,7 @@ RCT_EXPORT_VIEW_PROPERTY(maxDelta, CGFloat)
 RCT_EXPORT_VIEW_PROPERTY(minDelta, CGFloat)
 RCT_EXPORT_VIEW_PROPERTY(legalLabelInsets, UIEdgeInsets)
 RCT_EXPORT_VIEW_PROPERTY(mapType, MKMapType)
-RCT_EXPORT_VIEW_PROPERTY(annotations, MKShapeArray)
+RCT_EXPORT_VIEW_PROPERTY(annotations, RCTPointAnnotationArray)
 RCT_CUSTOM_VIEW_PROPERTY(region, MKCoordinateRegion, RCTMap)
 {
   [view setRegion:json ? [RCTConvert MKCoordinateRegion:json] : defaultView.region animated:YES];
@@ -50,6 +53,73 @@ RCT_CUSTOM_VIEW_PROPERTY(region, MKCoordinateRegion, RCTMap)
 
 #pragma mark MKMapViewDelegate
 
+
+
+- (void)mapView:(MKMapView *)mapView didSelectAnnotationView:(MKAnnotationView *)view
+{
+  if (![view.annotation isKindOfClass:[MKUserLocation class]]) {
+
+    RCTPointAnnotation *annotation = (RCTPointAnnotation *)view.annotation;
+    NSString *title = view.annotation.title ?: @"";
+    NSString *subtitle = view.annotation.subtitle ?: @"";
+
+    NSDictionary *event = @{
+                            @"target": mapView.reactTag,
+                            @"action": @"annotation-click",
+                            @"annotation": @{
+                                @"id": annotation.identifier,
+                                @"title": title,
+                                @"subtitle": subtitle,
+                                @"latitude": @(annotation.coordinate.latitude),
+                                @"longitude": @(annotation.coordinate.longitude)
+                                }
+                            };
+
+    [self.bridge.eventDispatcher sendInputEventWithName:@"topTap" body:event];
+  }
+}
+
+- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(RCTPointAnnotation *)annotation
+{
+  if ([annotation isKindOfClass:[MKUserLocation class]]) {
+    return nil;
+  }
+
+  MKPinAnnotationView *annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:@"RCTAnnotation"];
+
+  annotationView.canShowCallout = true;
+  annotationView.animatesDrop = annotation.animateDrop;
+
+  annotationView.leftCalloutAccessoryView = nil;
+  if (annotation.hasLeftCallout) {
+    annotationView.leftCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
+  }
+
+  annotationView.rightCalloutAccessoryView = nil;
+  if (annotation.hasRightCallout) {
+    annotationView.rightCalloutAccessoryView = [UIButton buttonWithType:UIButtonTypeDetailDisclosure];
+  }
+
+  return annotationView;
+}
+
+- (void)mapView:(MKMapView *)mapView annotationView:(MKAnnotationView *)view calloutAccessoryControlTapped:(UIControl *)control
+{
+  // Pass to js
+  RCTPointAnnotation *annotation = (RCTPointAnnotation *)view.annotation;
+  NSString *side = (control == view.leftCalloutAccessoryView) ? @"left" : @"right";
+
+  NSDictionary *event = @{
+      @"target": mapView.reactTag,
+      @"side": side,
+      @"action": @"callout-click",
+      @"annotationId": annotation.identifier
+    };
+
+  [self.bridge.eventDispatcher sendInputEventWithName:@"topTap" body:event];
+}
+
+
 - (void)mapView:(RCTMap *)mapView didUpdateUserLocation:(MKUserLocation *)location
 {
   if (mapView.followUserLocation) {
@@ -143,7 +213,7 @@ RCT_CUSTOM_VIEW_PROPERTY(region, MKCoordinateRegion, RCTMap)
 #define FLUSH_NAN(value) (isnan(value) ? 0 : value)
 
   NSDictionary *event = @{
-    @"target": [mapView reactTag],
+    @"target": mapView.reactTag,
     @"continuous": @(continuous),
     @"region": @{
       @"latitude": @(FLUSH_NAN(region.center.latitude)),