fix(include): copy to originalAttributes before modifying attributes

lib/model.js

@@ -1767,7 +1767,7 @@ module.exports = (function() {
     tableNames[include.model.tableName] = true
 
     if (include.hasOwnProperty('attributes')) {
-      include.originalAttributes = include.attributes;
+      include.originalAttributes = include.attributes.slice(0);
       include.model.primaryKeyAttributes.forEach(function (attr) {
         if (include.attributes.indexOf(attr) === -1) {
           include.attributes.unshift(attr);