fieldname mapping for model.count added

lib/model.js

@@ -842,6 +842,8 @@ module.exports = (function() {
       validateIncludedElements.call(this, options);
     }
 
+    mapFieldNames.call(this, options, this);
+
     options.dataType = DataTypes.INTEGER;
     options.includeIgnoreAttributes = false;
     options.limit = null;