Code cleanup

src/app/creator-home-screen/creator-home-screen.component.ts

 import { Component, OnInit } from '@angular/core';
 import { MatDialog } from '@angular/material';
 import { RoomCreationComponent } from '../room-creation/room-creation.component';
-import { RoomListComponent } from '../room-list/room-list.component';
-import { Room } from '../room';
 
 @Component({
   selector: 'app-creator-home-screen',

src/app/room-list/room-list.component.ts

 import { Component, OnInit } from '@angular/core';
 import { Room } from '../room';
 import { RoomService } from '../room.service';
-import { AuthenticationService} from '../authentication.service';
-import {UserRole} from '../user-roles.enum';
+import { AuthenticationService } from '../authentication.service';
+import { UserRole } from '../user-roles.enum';
 
 @Component({
   selector: 'app-room-list',

src/app/room/room.component.ts

@@ -2,7 +2,6 @@ import { Component, OnInit } from '@angular/core';
 import { Room } from '../room';
 import { RoomService } from '../room.service';
 import { ActivatedRoute } from '@angular/router';
-import { Observable } from 'rxjs/Observable';
 import { Location } from '@angular/common';
 
 @Component({