Added toJSON method to DAO object so it behaves with backbone.js

lib/dao.js

@@ -223,6 +223,11 @@ module.exports = (function() {
   DAO.prototype.setValidators = function(attribute, validators) {
     this.validators[attribute] = validators
   }
+  
+  // RAG
+  DAO.prototype.toJSON = function() {
+    return this.values;
+  }
 
   // private