updating readme push -> PushNotification

README.md

@@ -214,7 +214,7 @@ A full example can be found in Examples.  To run it, copy the files:
     // Set an alias, this lets you tie a device to a user in your system
     // https://docs.urbanairship.com/display/DOCS/Server%3A+iOS+Push+API#ServeriOSPushAPI-Alias
     PushNotification.setAlias("awesomeuser22", function () {
-        push.getAlias(function (alias) {
+        PushNotification.getAlias(function (alias) {
             console.log("The user formerly known as " + alias)
         });
     });
@@ -288,7 +288,7 @@ On iOS, registration for push requires specifying what combination of badges, so
 alerts are desired.  This function must be explicitly called in order to begin the
 registration process.  For example:
 
-    push.registerForNotificationTypes(push.notificationType.sound | push.notificationType.alert)
+    PushNotification.registerForNotificationTypes(PushNotification.notificationType.sound | PushNotification.notificationType.alert)
 
 *Available notification types:*
 
@@ -302,7 +302,7 @@ registration process.  For example:
 
 All status callbacks are passed a boolean indicating the result of the request:
 
-    push.isPushEnabled(function (has_push) {
+    PushNotification.isPushEnabled(function (has_push) {
         if (has_push) {
             $('#pushEnabled').prop("checked", true)
         }
@@ -360,7 +360,7 @@ Indicates whether Quiet Time is currently in effect.
 
 Get information about the push that caused the application to be launched. When a user clicks on a push to launch your app, this functions callback will be passed a Push object consisting of the alert message, and an object containing extra key/value pairs.  Otherwise the incoming message and extras will be an empty string and an empty object, respectively.
 
-    push.getIncoming(function (incoming) {
+    PushNotification.getIncoming(function (incoming) {
         if (incoming.message) {
             alert("Incoming push message: " + incoming.message;
         }