Implemented the second round of the toResponse normalisationf for all classes

ref #67

src/models/entities/Address.ts

@@ -80,4 +80,11 @@ export class Address {
    */
   @OneToMany(() => IAddressUser, addressUser => addressUser.address, { nullable: true })
   addressUsers: IAddressUser[];
+
+  /**
+   * Turns this entity into it's response class.
+   */
+  public toResponse() {
+    return new Error("NotImplemented");
+  }
 }