feat(forms): changed the selector of TemplatdrivenFormDirective to match <form>

modules/angular2/src/forms/directives/template_driven_form_directive.ts

@@ -13,7 +13,10 @@ import {setUpControl} from './shared';
 const formDirectiveBinding = CONST_EXPR(new Binding(
     ControlContainerDirective, {toAlias: FORWARD_REF(() => TemplateDrivenFormDirective)}));
 
-@Directive({selector: '[form]', hostInjector: [formDirectiveBinding]})
+@Directive({
+  selector: 'form:not([ng-no-form]):not([form-model]),ng-form,[ng-form]',
+  hostInjector: [formDirectiveBinding]
+})
 export class TemplateDrivenFormDirective extends ControlContainerDirective implements
     FormDirective {
   form: ControlGroup;