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/src/router/route_config_impl.ts

@@ -22,10 +22,15 @@ export class Route implements RouteDefinition {
   path: string;
   component: Type;
   as: string;
+  // added next two properties to work around https://github.com/Microsoft/TypeScript/issues/4107
+  loader: Function;
+  redirectTo: string;
   constructor({path, component, as}: {path: string, component: Type, as?: string}) {
     this.path = path;
     this.component = component;
     this.as = as;
+    this.loader = null;
+    this.redirectTo = null;
   }
 }