Remove the default values for gateway/port

lib/models/application.js

@@ -9,18 +9,28 @@ var AuthenticationSchemeSchema = {
 
 // See https://github.com/argon/node-apn/blob/master/doc/apn.markdown
 var APNSSettingSchema = {
-  production: Boolean, // production or development mode
-  certData: String, // The certificate data
-  keyData: String, // The key data
+  /**
+   * production or development mode. It denotes what default APNS servers to be
+   * used to send notifications
+   * - true (production mode)
+   *   - push: gateway.push.apple.com:2195
+   *   - feedback: feedback.push.apple.com:2196
+   * - false (development mode, the default)
+   *   - push: gateway.sandbox.push.apple.com:2195
+   *   - feedback: feedback.sandbox.push.apple.com:2196
+   */
+  production: Boolean,
+  certData: String, // The certificate data loaded from the cert.pem file
+  keyData: String, // The key data loaded from the key.pem file
 
   pushOptions: {type: {
-    gateway: {type: String, default: 'gateway.sandbox.push.apple.com'},
-    port: {type: Number, default: 2195}
+    gateway: String,
+    port: Number
   }},
 
   feedbackOptions: {type: {
-    gateway: {type: String, default: 'feedback.sandbox.push.apple.com'},
-    port: {type: Number, default: 2196},
+    gateway: String,
+    port: Number,
     batchFeedback: Boolean,
     interval: Number
   }}