refactor: move all utility functions into the utils dir

modules/@angular/router/src/recognize.ts

@@ -1,11 +1,10 @@
 import { UrlTree, UrlSegment, equalUrlSegments } from './url_tree';
-import { shallowEqual, flatten, first, merge } from './util';
-import { TreeNode, rootNode } from './tree';
+import { shallowEqual, flatten, first, merge } from './utils/collection';
+import { TreeNode, rootNode } from './utils/tree';
 import { RouterState, ActivatedRoute, Params, PRIMARY_OUTLET } from './router_state';
 import { RouterConfig, Route } from './config';
 import { ComponentResolver, ComponentFactory, Type } from '@angular/core';
 import { BehaviorSubject } from 'rxjs/BehaviorSubject';
-import { Observer } from 'rxjs/Observer';
 
 export function recognize(componentResolver: ComponentResolver, config: RouterConfig,
                           url: UrlTree, existingState: RouterState): Promise<RouterState> {

modules/@angular/router/src/router.ts

@@ -3,12 +3,12 @@ import { Location } from '@angular/common';
 import { UrlSerializer } from './url_serializer';
 import { RouterOutletMap } from './router_outlet_map';
 import { recognize } from './recognize';
-import { rootNode, TreeNode } from './tree';
+import { rootNode, TreeNode } from './utils/tree';
 import { UrlTree } from './url_tree';
 import { createEmptyState, RouterState, ActivatedRoute, PRIMARY_OUTLET } from './router_state';
 import { RouterConfig } from './config';
 import { RouterOutlet } from './directives/router_outlet';
-import { forEach } from './util';
+import { forEach } from './utils/collection';
 import { Subscription } from 'rxjs/Subscription';
 
 /**

modules/@angular/router/src/router_state.ts

@@ -1,4 +1,4 @@
-import { Tree, TreeNode } from './tree';
+import { Tree, TreeNode } from './utils/tree';
 import { UrlSegment } from './url_tree';
 import { Observable } from 'rxjs/Observable';
 import { BehaviorSubject } from 'rxjs/BehaviorSubject';

modules/@angular/router/src/url_serializer.ts

@@ -1,5 +1,5 @@
 import { UrlTree, UrlSegment } from './url_tree';
-import { rootNode, TreeNode } from './tree';
+import { rootNode, TreeNode } from './utils/tree';
 
 /**
  * Defines a way to serialize/deserialize a url tree.

modules/@angular/router/src/url_tree.ts

@@ -1,5 +1,5 @@
-import { Tree, TreeNode } from './tree';
-import { shallowEqual } from './util';
+import { Tree, TreeNode } from './utils/tree';
+import { shallowEqual } from './utils/collection';
 
 /**
  * A URL in the tree form.