feat(UIRouter): Add trace global to the UIRouter object

Author: christopherthielen

src/router.ts

@@ -14,6 +14,7 @@ import { values, removeFrom } from "./common/common";
 import { isFunction } from "./common/predicates";
 import { UrlService } from "./url/urlService";
 import { LocationServices, LocationConfig } from "./common/coreservices";
+import { Trace, trace } from "./common/trace";
 
 /** @hidden */
 let _routerInstance = 0;
@@ -37,6 +38,9 @@ export class UIRouter {
   /** @hidden */
   $id: number = _routerInstance++;
 
+  /** Provides trace information to the console */
+  trace: Trace = trace;
+
   /** Provides services related to ui-view synchronization */
   viewService = new ViewService();