feat(router): add interfaces for route definitions in RouteConfig

Closes #2261

modules/angular2/src/router/route_definition.ts

@@ -0,0 +1,15 @@
+import {CONST, Type} from 'angular2/src/facade/lang';
+
+export interface RouteDefinition {
+  path: string;
+  component?: Type | ComponentDefinition;
+  loader?: Function;
+  redirectTo?: string;
+  as?: string;
+}
+
+export interface ComponentDefinition {
+  type: string;
+  loader?: Function;
+  component?: Type;
+}