feat(input): Allow custom events and timeouts to trigger model updates

By default, any change on the content will trigger an immediate model update
and form validation. Now you can override this behavior using the
`ng-update-model-on` attribute to bind only to a comma-delimited list of events.

I.e. `ng-update-model-on="blur"` will update and validate only after the control
loses focus.

If you want to keep the default behavior and just add new events that may
trigger the model update and validation, add `default` as one of the specified
events.

I.e. `ng-update-model-on="default,mousedown"`

Also, a `ng-update-model-debounce` attribute will allow defering the actual model
update some time after the last trigger event takes place (debouncing). This
feature is not available in radio buttons.

I.e. `ng-update-model-debounce="500"`

Custom debouncing timeouts can be set for each event if you use an object
in `ng-update-model-on`.

I.e. `ng-update-model-on="{default: 500, blur: 0}"`

You can specify both attributes in any tag so they became the default settings
for any child control, although they can be overriden.

Closes angular#1285

angularFiles.js

@@ -63,6 +63,7 @@ angularFiles = {
     'src/ng/directive/ngStyle.js',
     'src/ng/directive/ngSwitch.js',
     'src/ng/directive/ngTransclude.js',
+    'src/ng/directive/ngUpdateModel.js',
     'src/ng/directive/script.js',
     'src/ng/directive/select.js',
     'src/ng/directive/style.js'

docs/content/guide/forms.ngdoc

@@ -180,6 +180,46 @@ This allows us to extend the above example with these features:
 </example>
 
 
+# Non-immediate (debounced) or custom triggered model updates
+
+By default, any change on the content will trigger a model update and form validation. You can override this behavior using the `ng-update-model-on`
+attribute to bind only to a comma-delimited list of events. I.e. `ng-update-model-on="blur"` will update and validate only after the control loses
+focus.
+
+If you want to keep the default behavior and just add new events that may trigger the model update
+and validation, add "default" as one of the specified events. I.e. `ng-update-model-on="default,mousedown"`
+
+You can delay the model update/validation using `ng-update-model-debounce`. I.e. `ng-update-model-debounce="500"` will wait for half a second since
+the last content change before triggering the model update and form validation. This debouncing feature is not available on radio buttons.
+
+Custom debouncing timeouts can be set for each event for each event if you use an object in `ng-update-model-on`.
+I.e. `ng-update-model-on="{default: 500, blur: 0}"`
+
+Using the object notation allows any valid Angular expression to be used inside, including data and function calls from the scope.
+
+If those attributes are added to an element, they will be applied to all the child elements and controls that inherit from it unless they are
+overriden.
+
+The following example shows how to override immediate updates. Changes on the inputs within the form will update the model 
+only when the control loses focus (blur event).
+
+<doc:example>
+<doc:source>
+<div ng-controller="ControllerUpdateOn">
+  <form name="form" class="css-form" ng-update-model-on="blur">
+    Name:
+    <input type="text" ng-model="user.name" name="uName" /><br />
+  </form>
+  <pre>model = {{user | json}}</pre>
+</div>
+<script>
+  function ControllerUpdateOn($scope) {
+    $scope.user = {};
+  }
+</script>
+</doc:source>
+</doc:example>
+
 
 # Custom Validation
 

src/AngularPublic.js

@@ -48,6 +48,8 @@
     ngValueDirective,
     ngAttributeAliasDirectives,
     ngEventDirectives,
+    ngUpdateModelOnDirective,
+    ngUpdateModelDebounceDirective,
 
     $AnchorScrollProvider,
     $AnimateProvider,
@@ -183,6 +185,8 @@ function publishExternalAPI(angular){
             ngChange: ngChangeDirective,
             required: requiredDirective,
             ngRequired: requiredDirective,
+            ngUpdateModelOn: ngUpdateModelOnDirective,
+            ngUpdateModelDebounce: ngUpdateModelDebounceDirective,
             ngValue: ngValueDirective
         }).
         directive({