Send broadcast function: added missing args(notification and tag)

docs/readme-facebook.md

@@ -710,6 +710,22 @@ controller.api.broadcast.send('<CREATIVE_ID>', null, function (err, body) {
 });
 ```
 
+If you would like to add notification type and tag you can pass an object:
+
+```javascript
+var message = {
+    message_creative_id: '<CREATIVE_ID>',
+    notification_type: '<REGULAR | SILENT_PUSH | NO_PUSH>',
+    tag: '<MESSAGE_TAG>'
+}
+
+controller.api.broadcast.send(message, null, function (err, body) {
+    // Your awesome code here
+    console.log(body['broadcast_id']);
+    // And here
+});
+```
+
 ### Broadcast Metrics
 
 Once a broadcast has been delivered, you can find out the total number of people it reached by calling ```controller.api.broadcast.get_broadcast_metrics(...)```.

lib/Facebook.js

@@ -1182,16 +1182,21 @@ function Facebookbot(configuration) {
                 }
             });
         },
-        send: function(message_creative_id, custom_label_id, cb) {
+        send: function(message_creative, custom_label_id, cb) {
             var uri = 'https://' + api_host + '/' + api_version + '/me/broadcast_messages?access_token=' + configuration.access_token;
+            var body = {};
 
             if (facebook_botkit.config.require_appsecret_proof) {
                 uri += '&appsecret_proof=' + appsecret_proof;
             }
 
-            var body = {
-                'message_creative_id': message_creative_id
-            };
+            if (typeof message_creative === 'string') {
+                body = {
+                    'message_creative_id': message_creative
+                };
+            } else {
+                body = message_creative;
+            }
 
             if (custom_label_id) {
                 body.custom_label_id = custom_label_id;