refactor(router): move setting reuse flag from RouterOutlet to Router

Author: btford

modules/angular2/src/router/router.ts

@@ -253,6 +253,7 @@ export class Router {
     }
     return this._outlet.canReuse(instruction.component)
         .then((result) => {
+          instruction.component.reuse = result;
           if (isPresent(this._childRouter) && isPresent(instruction.child)) {
             return this._childRouter._canReuse(instruction.child);
           }

modules/angular2/src/router/router_outlet.ts

@@ -120,10 +120,6 @@ export class RouterOutlet {
                (isPresent(nextInstruction.params) && isPresent(this._currentInstruction.params) &&
                 StringMapWrapper.equals(nextInstruction.params, this._currentInstruction.params));
     }
-    return PromiseWrapper.resolve(result).then((result) => {
-      // TODO: this is a hack
-      nextInstruction.reuse = result;
-      return result;
-    });
+    return PromiseWrapper.resolve(result);
   }
 }