Implemented deep address validation

ref #105

src/models/actions/create/CreateGroupContact.ts

@@ -62,6 +62,7 @@ export class CreateGroupContact {
         contact.email = this.email;
         contact.phone = this.phone;
         contact.address = this.address;
-        return null;
+        Address.validate(contact.address);
+        return contact;
     }
 }