.equals() should compare dataValues directly

Avoids changes created by other's getters

lib/instance.js

@@ -994,11 +994,14 @@ Instance.prototype.decrement = function(fields, options) {
 Instance.prototype.equals = function(other) {
   var result = true;
   
+  if(!other || !other.dataValues)
+    return false;
+
   Utils._.each(this.dataValues, function(value, key) {
-    if (Utils._.isDate(value) && Utils._.isDate(other[key])) {
-      result = result && (value.getTime() === other[key].getTime());
+    if (Utils._.isDate(value) && Utils._.isDate(other.dataValues[key])) {
+      result = result && (value.getTime() === other.dataValues[key].getTime());
     } else {
-      result = result && (value === other[key]);
+      result = result && (value === other.dataValues[key]);
     }
   });