Cleaned up realations regarding response classes

ref #132

src/models/entities/UserGroup.ts

@@ -4,7 +4,6 @@ import {
   IsString
 } from "class-validator";
 import { ChildEntity, Column } from "typeorm";
-import { ResponsePrincipal } from '../responses/ResponsePrincipal';
 import { ResponseUserGroup } from '../responses/ResponseUserGroup';
 import { Principal } from './Principal';
 
@@ -34,7 +33,7 @@ export class UserGroup extends Principal {
   /**
    * Turns this entity into it's response class.
    */
-  public toResponse(): ResponsePrincipal {
+  public toResponse(): ResponseUserGroup {
     return new ResponseUserGroup(this);
   }
 }