[ng] template-syntax example component rename (#326)

This PR is a propagation of a final round of changes made to the TS
example; see
angular/angular.io#2750 (comment)

E2E tests are still passing.

Fixes #286

Author: chalin

public/docs/_examples/template-syntax/dart/lib/app_component.dart

@@ -18,9 +18,9 @@ enum Color { red, green, blue }
     directives: const [
       HeroDetailComponent,
       BigHeroDetailComponent,
-      MyClickDirective,
-      MyClickDirective2,
-      MySizerComponent
+      ClickDirective,
+      ClickDirective2,
+      SizerComponent
     ])
 class AppComponent implements OnInit, AfterViewInit {
   @override

public/docs/_examples/template-syntax/dart/lib/app_component.html

@@ -305,7 +305,7 @@ <h3>
 
 <div>
 <!-- #docregion event-binding-3 -->
-<!-- `myClick` is an event on the custom `MyClickDirective` -->
+<!-- `myClick` is an event on the custom `ClickDirective` -->
 <!-- #docregion myClick -->
 <div (myClick)="clickMessage=$event">click with myClick</div>
 <!-- #enddocregion myClick -->

public/docs/_examples/template-syntax/dart/lib/click_directive.dart

@@ -4,15 +4,15 @@ import 'dart:html';
 import 'package:angular2/core.dart';
 
 @Directive(selector: '[myClick]')
-class MyClickDirective {
+class ClickDirective {
   // #docregion output-myClick
   // @Output(alias) [type info] propertyName = ...
   @Output('myClick') final EventEmitter clicks = new EventEmitter<String>();
 
   // #enddocregion output-myClick
   bool _toggle = false;
 
-  MyClickDirective(ElementRef el) {
+  ClickDirective(ElementRef el) {
     Element nativeEl = el.nativeElement;
     nativeEl.onClick.listen((Event e) {
       _toggle = !_toggle;
@@ -29,11 +29,11 @@ class MyClickDirective {
     // ...
     outputs: const ['clicks:myClick']) // propertyName:alias
 // #enddocregion output-myClick2
-class MyClickDirective2 {
+class ClickDirective2 {
   final EventEmitter clicks = new EventEmitter<String>();
   bool _toggle = false;
 
-  MyClickDirective2(ElementRef el) {
+  ClickDirective2(ElementRef el) {
     el.nativeElement.onClick.listen((Event e) {
       _toggle = !_toggle;
       clicks.emit(_toggle ? 'Click2!' : '');

public/docs/_examples/template-syntax/dart/lib/sizer_component.dart

@@ -10,7 +10,7 @@ import 'package:angular2/core.dart';
         <button (click)="inc()" title="bigger">+</button>
         <label [style.font-size.px]="size">FontSize: {{size}}px</label>
       </div>''')
-class MySizerComponent {
+class SizerComponent {
   static final defaultPxSize = 14;
 
   @Input()