chore(build): Upgrade to TypeScript@1.5.3

This change also makes us compliant with 1.6.0-dev compiler,
so we can do some experiments with apps that use 1.6 features
and compile against Angular.

We should probably add a travis build for 1.6 so we stay compatible
with both versions.

modules/angular2/annotations.ts

@@ -27,12 +27,7 @@ export {
 } from 'angular2/src/core/compiler/interfaces';
 
 
-export {
-  Class,
-  ClassDefinition,
-  ParameterDecorator,
-  TypeDecorator
-} from 'angular2/src/util/decorators';
+export {Class, ClassDefinition, TypeDecorator} from 'angular2/src/util/decorators';
 
 export {
   Attribute,