Change from _.each to native forEach

lib/sequelize.js

@@ -152,7 +152,7 @@ module.exports = (function() {
     var globalOptions = this.options
 
     // If you don't specify a valid data type lets help you debug it
-    Utils._.each(attributes, function(dataType, name){
+    attributes.forEach(function(dataType, name){
       if (Utils.isHash(dataType)) {
         dataType = dataType.type
       }