added support for authWithCustomToken

src/backbonefire.js

@@ -240,6 +240,21 @@
 
   };
 
+  /**
+   * A utility for athenticating with a custom token
+   */
+  Backbone.Firebase._authWithCustomToken = function(model, options) {
+    if(typeof options !== 'undefined' && typeof options.auth_token !== 'undefined'){
+      model.firebase.ref().authWithCustomToken(options.auth_token, function(error, authData) {
+        if (error) {
+          model.trigger('firebase:login:error', error, null, null);
+        } else {
+          model.trigger('firebase:login:success', authData, null, null);
+        }
+      });
+    }
+  };
+
   /**
    * Model responsible for autoSynced objects
    * This model is never directly used. The Backbone.Firebase.Model will
@@ -340,6 +355,9 @@
         Backbone.Firebase._throwError('url parameter required');
       }
 
+      // We handle login with a custom token
+      Backbone.Firebase._authWithCustomToken(this, options);
+
       if(!this.autoSync) {
         OnceModel.apply(this, arguments);
         _.extend(this, OnceModel.protoype);
@@ -818,6 +836,9 @@
         throw new Error('url parameter required');
       }
 
+      // We handle login with a custom token
+      Backbone.Firebase._authWithCustomToken(this, options);
+
       // if we are not autoSyncing, the model needs
       // to be a non-autoSynced model
       if(!this.autoSync) {