refactor(forms): Even better forms

- remove $formFactory completely
- remove parallel scope hierarchy (forms, widgets)
- use new compiler features (widgets, forms are controllers)
- any directive can add formatter/parser (validators, convertors)

Breaks no custom input types
Breaks removed integer input type
Breaks remove list input type (ng-list directive instead)
Breaks inputs bind only blur event by default (added ng:bind-change directive)

docs/content/api/angular.inputType.ngdoc

@@ -32,61 +32,3 @@ All `inputType` widgets support:
     - **`ng:pattern`** Sets `PATTERN` validation error key if the value does not match the
       RegExp pattern expression. Expected value is `/regexp/` for inline patterns or `regexp` for
       patterns defined as scope expressions.
-
-
-
-# Example
-
-<doc:example>
-<doc:source>
-   <script>
-     angular.inputType('json', function(element, scope) {
-       scope.$parseView = function() {
-         try {
-           this.$modelValue = angular.fromJson(this.$viewValue);
-           if (this.$error.JSON) {
-             this.$emit('$valid', 'JSON');
-           }
-         } catch (e) {
-             this.$emit('$invalid', 'JSON');
-         }
-       }
-
-       scope.$parseModel = function() {
-         this.$viewValue = angular.toJson(this.$modelValue);
-       }
-     });
-
-     function Ctrl($scope) {
-       $scope.data = {
-         framework:'angular',
-         codenames:'supper-powers'
-       }
-       $scope.required = false;
-       $scope.disabled = false;
-       $scope.readonly = false;
-     }
-   </script>
-   <div ng:controller="Ctrl">
-     <form name="myForm">
-       <input type="json" ng:model="data" size="80"
-              ng:required="{{required}}" ng:disabled="{{disabled}}"
-              ng:readonly="{{readonly}}"/><br/>
-       Required: <input type="checkbox" ng:model="required"> <br/>
-       Disabled: <input type="checkbox" ng:model="disabled"> <br/>
-       Readonly: <input type="checkbox" ng:model="readonly"> <br/>
-      <pre>data={{data}}</pre>
-       <pre>myForm={{myForm}}</pre>
-     </form>
-   </div>
-</doc:source>
-<doc:scenario>
-  it('should invalidate on wrong input', function() {
-    expect(element('form[name=myForm]').prop('className')).toMatch('ng-valid');
-    input('data').enter('{}');
-    expect(binding('data')).toEqual('{}');
-    input('data').enter('{');
-    expect(element('form[name=myForm]').prop('className')).toMatch('ng-invalid');
-  });
-</doc:scenario>
-</doc:example>