chore(lint): require semicolons

Relying on ASI (automatic semicolon insertion)
is allowed in TypeScript because JavaScript allows
it. However, when we run clang-format it doesn’t
understand that these statements are terminated
with a newline and changes the indentation, in bad
cases even breaking the code.

Fixes #817

modules/angular2/src/directives/ng_switch.ts

@@ -164,7 +164,7 @@ export class NgSwitchWhen {
     this._view = new SwitchView(viewContainer, protoViewRef);
   }
 
-  onDestroy() { this._switch }
+  onDestroy() { this._switch; }
 
   set ngSwitchWhen(value) {
     this._switch._onWhenValueChanged(this._value, value, this._view);