-import { Component, OnInit } from '@angular/core';
-import { Router, ROUTER_DIRECTIVES, RouteSegment } from '@angular/router';
+import { ChangeDetectorRef, Component, OnDestroy, OnInit } from '@angular/core';
+import { AsyncPipe } from '@angular/common';
+import { ActivatedRoute, Router, ROUTER_DIRECTIVES } from '@angular/router';
+import { BehaviorSubject } from 'rxjs/BehaviorSubject';