cleanup

src/app/search/search.component.ts

@@ -1,16 +1,11 @@
 import { Component, OnInit } from '@angular/core';
 import { Http } from '@angular/http';
 
-import { Observable }        from 'rxjs/Observable';
-import { Subject }           from 'rxjs/Subject';
+import { Subject } from 'rxjs/Subject';
 
 // Observable class extensions
-import 'rxjs/add/observable/of';
 import 'rxjs/add/operator/switchMap';
 import 'rxjs/add/operator/map';
-
-// Observable operators
-import 'rxjs/add/operator/catch';
 import 'rxjs/add/operator/debounceTime';
 import 'rxjs/add/operator/distinctUntilChanged';