set validate option default to true for DAO-Factory.update

lib/dao-factory.js

@@ -654,7 +654,7 @@ module.exports = (function() {
    */
   DAOFactory.prototype.update = function(attrValueHash, where, options) {
     options = options || {}
-    options.validate = Boolean(options.validate)
+    options.validate = options.validate === undefined ? true : Boolean(options.validate)
     
     if(this.options.timestamps) {
       var attr = Utils._.underscoredIf(this.options.updatedAt, this.options.underscored)

test/dao.validations.test.js

@@ -288,7 +288,7 @@ describe(Support.getTestDialectTeaser("DaoValidator"), function() {
 
         Model.sync({ force: true }).success(function() {
           Model.create({name: 'World'}).success(function(model) {
-            Model.update({name: ''}, {id: 1}, {validate:true}).error(function(err) {
+            Model.update({name: ''}, {id: 1}).error(function(err) {
               expect(err).to.deep.equal({ name: [ 'String is empty: name', 'String is empty: name' ] })
               done()
             })