don't use Utils._.map for iteration over objects

lib/dao.js

@@ -266,7 +266,9 @@ module.exports = (function() {
     var self = this
 
     // add all passed values to the dao and store the attribute names in this.attributes
-    Utils._.map(values, function(value, key) { self.addAttribute(key, value) })
+    for (var key in values) {
+      this.addAttribute(key, values[key])
+    }
 
     // set id to null if not passed as value
     // a newly created dao has no id