Added .catch to custom event emitter

lib/emitters/custom-event-emitter.js

@@ -161,5 +161,9 @@ module.exports = (function() {
     }).spread(onFulfilled, onRejected)
   }
 
+  CustomEventEmitter.prototype.catch = function(onRejected) {
+    return this.then(null, onRejected)
+  }
+
   return CustomEventEmitter
 })()

test/promise.test.js

@@ -272,7 +272,8 @@ describe(Support.getTestDialectTeaser("Promise"), function () {
 
   describe('save', function () {
     it('should fail a validation upon creating', function(done) {
-      this.User.create({aNumber: 0, validateTest: 'hello'}).then(null, function(err) {
+      this.User.create({aNumber: 0, validateTest: 'hello'})
+        .catch(function(err) {
           expect(err).to.be.ok
           expect(err).to.be.an("object")
           expect(err.validateTest).to.be.an("array")
@@ -284,7 +285,7 @@ describe(Support.getTestDialectTeaser("Promise"), function () {
 
     it('should fail a validation upon building', function(done) {
       this.User.build({aNumber: 0, validateCustom: 'aaaaaaaaaaaaaaaaaaaaaaaaaa'}).save()
-      .then(null, function(err) {
+        .catch(function(err) {
           expect(err).to.be.ok
           expect(err).to.be.an("object")
           expect(err.validateCustom).to.be.ok
@@ -298,7 +299,7 @@ describe(Support.getTestDialectTeaser("Promise"), function () {
     it('should fail a validation when updating', function(done) {
       this.User.create({aNumber: 0}).then(function (user) {
         return user.updateAttributes({validateTest: 'hello'})
-      }).then(null, function(err) {
+      }).catch(function(err) {
         expect(err).to.be.ok
         expect(err).to.be.an("object")
         expect(err.validateTest).to.be.ok