feat(core): desugar [()] to [prop] and (prop-change)

BREAKING CHANGE

Before

```
<cmp [(prop)]="field"> was desugared to <cmp [prop]="field" (prop)="field=$event">
```

After
```
<cmp [(prop)]="field"> is desugared to <cmp [prop]="field" (prop-change)="field=$event">
```

Closes #4658

modules/angular2/src/core/compiler/template_parser.ts

@@ -361,7 +361,8 @@ class TemplateParseVisitor implements HtmlAstVisitor {
 
   private _parseAssignmentEvent(name: string, expression: string, sourceInfo: string,
                                 targetMatchableAttrs: string[][], targetEvents: BoundEventAst[]) {
-    this._parseEvent(name, `${expression}=$event`, sourceInfo, targetMatchableAttrs, targetEvents);
+    this._parseEvent(`${name}-change`, `${expression}=$event`, sourceInfo, targetMatchableAttrs,
+                     targetEvents);
   }
 
   private _parseEvent(name: string, expression: string, sourceInfo: string,

modules/angular2/src/core/forms/directives/ng_control_name.ts

@@ -75,7 +75,7 @@ const controlNameBinding =
   selector: '[ng-control]',
   bindings: [controlNameBinding],
   inputs: ['name: ngControl', 'model: ngModel'],
-  outputs: ['update: ngModel'],
+  outputs: ['update: ngModelChange'],
   exportAs: 'form'
 })
 export class NgControlName extends NgControl implements OnChanges,

modules/angular2/src/core/forms/directives/ng_form_control.ts

@@ -66,7 +66,7 @@ const formControlBinding =
   selector: '[ng-form-control]',
   bindings: [formControlBinding],
   inputs: ['form: ngFormControl', 'model: ngModel'],
-  outputs: ['update: ngModel'],
+  outputs: ['update: ngModelChange'],
   exportAs: 'form'
 })
 export class NgFormControl extends NgControl implements OnChanges {

modules/angular2/src/core/forms/directives/ng_model.ts

@@ -37,7 +37,7 @@ const formControlBinding = CONST_EXPR(new Binding(NgControl, {toAlias: forwardRe
   selector: '[ng-model]:not([ng-control]):not([ng-form-control])',
   bindings: [formControlBinding],
   inputs: ['model: ngModel'],
-  outputs: ['update: ngModel'],
+  outputs: ['update: ngModelChange'],
   exportAs: 'form'
 })
 export class NgModel extends NgControl implements OnChanges {