add local notification api schedule and present

Summary:
Add local notifications to the push library.
```
  var PushNotificationIOS = React.PushNotificationIOS;
  PushNotificationIOS.requestPermissions();

  var notification = {
    "fireDate": Date.now() + 10000,
    "alertBody":"Whats up pumpkin"
  };

  PushNotificationIOS.scheduleLocalNotification(notification);
 //lock screen or move away from app
```

Apple has another api for pushing immediately instead of scheduling, like when your background delegate has been called with some new data (bluetooth, location, etc)
```
  var PushNotificationIOS = React.PushNotificationIOS;
  PushNotificationIOS.requestPermissions();

  var notification = {
    "alertBody":"Whats up pumpkin"
  };

  PushNotificationIOS.presentLocalNotification(notification);
 //lock screen or move away from app
```

Closed https://github.com/facebook/react-native/pull/843 looks related:

See https://developer.apple.com/library/ios/documentation/iPhone/Reference/UILocalNotification_Class/ for much more available in
Closes https://github.com/facebook/react-native/pull/1616
Github Author: Jacob Rosenthal <jakerosenthal@gmail.com>

Libraries/PushNotificationIOS/PushNotificationIOS.js

@@ -36,6 +36,31 @@ class PushNotificationIOS {
   _sound: string;
   _badgeCount: number;
 
+  /**
+   * Schedules the localNotification for immediate presentation.
+   *
+   * details is an object containing:
+   *
+   * - `alertBody` : The message displayed in the notification alert.
+   *
+   */
+  static presentLocalNotification(details: Object) {
+    RCTPushNotificationManager.presentLocalNotification(details);
+  }
+
+  /**
+   * Schedules the localNotification for future presentation.
+   *
+   * details is an object containing:
+   *
+   * - `fireDate` : The date and time when the system should deliver the notification.
+   * - `alertBody` : The message displayed in the notification alert.
+   *
+   */
+  static scheduleLocalNotification(details: Object) {
+    RCTPushNotificationManager.scheduleLocalNotification(details);
+  }
+
   /**
    * Sets the badge number for the app icon on the home screen
    */

Libraries/PushNotificationIOS/RCTPushNotificationManager.m

@@ -10,6 +10,7 @@
 #import "RCTPushNotificationManager.h"
 
 #import "RCTBridge.h"
+#import "RCTConvert.h"
 #import "RCTEventDispatcher.h"
 #import "RCTUtils.h"
 
@@ -26,6 +27,19 @@
 NSString *const RCTRemoteNotificationReceived = @"RemoteNotificationReceived";
 NSString *const RCTRemoteNotificationsRegistered = @"RemoteNotificationsRegistered";
 
+@implementation RCTConvert (UILocalNotification)
+
++ (UILocalNotification *)UILocalNotification:(id)json
+{
+  NSDictionary *details = [self NSDictionary:json];
+  UILocalNotification *notification = [[UILocalNotification alloc] init];
+  notification.fireDate = [RCTConvert NSDate:details[@"fireDate"]] ?: [NSDate date];
+  notification.alertBody = [RCTConvert NSString:details[@"alertBody"]];
+  return notification;
+}
+
+@end
+
 @implementation RCTPushNotificationManager
 {
   NSDictionary *_initialNotification;
@@ -139,11 +153,15 @@ RCT_EXPORT_METHOD(requestPermissions:(NSDictionary *)permissions)
   }
 
 #if __IPHONE_OS_VERSION_MIN_REQUIRED >= __IPHONE_8_0
+
   id notificationSettings = [UIUserNotificationSettings settingsForTypes:types categories:nil];
   [[UIApplication sharedApplication] registerUserNotificationSettings:notificationSettings];
   [[UIApplication sharedApplication] registerForRemoteNotifications];
+
 #else
+
   [[UIApplication sharedApplication] registerForRemoteNotificationTypes:types];
+
 #endif
 
 }
@@ -183,4 +201,15 @@ RCT_EXPORT_METHOD(checkPermissions:(RCTResponseSenderBlock)callback)
   };
 }
 
+RCT_EXPORT_METHOD(presentLocalNotification:(UILocalNotification *)notification)
+{
+  [[UIApplication sharedApplication] presentLocalNotificationNow:notification];
+}
+
+
+RCT_EXPORT_METHOD(scheduleLocalNotification:(UILocalNotification *)notification)
+{
+  [[UIApplication sharedApplication] scheduleLocalNotification:notification];
+}
+
 @end