fixes a race when logging out

If the logout request does not complete in time, the browser does not
update the cookie as expired. We now wait for the logout request to
succeed before reloading

fixes #16

src/app/header-bar/header-bar.component.ts

@@ -67,8 +67,9 @@ export class HeaderBarComponent implements OnInit {
   }
 
   logout() {
-    this.authService.logout();
-    window.location.reload();
+    this.authService.logout().subscribe(() => {
+      window.location.reload();
+    });
   }
 
   searchCharts(input: HTMLInputElement): void {

src/app/shared/services/auth.service.ts

@@ -45,8 +45,8 @@ export class AuthService {
   /**
    * Logs user out
    */
-  logout() {
+  logout(): Observable<Response> {
     this.cookieService.remove('ka_claims');
-    this.http.delete(`${this.hostname}/auth/logout`, {withCredentials: true}).subscribe();
+    return this.http.delete(`${this.hostname}/auth/logout`, {withCredentials: true});
   }
 }