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/core/annotations/decorators.ts

@@ -52,7 +52,7 @@ export interface ViewDecorator extends TypeDecorator {
     renderer?: string,
     styles?: List<string>,
     styleUrls?: List<string>,
-  }): ViewDecorator
+  }): ViewDecorator;
 }
 
 /**