Include model.spec.js for endpoints

The user model on the initial app includes user.model.spec.js. It would be nice that the generator automatically includes that because it's not on the list of created files

$ yo angular-fullstack:endpoint client
? What will the url of your endpoint be? /api/clients
   create server/api/client/index.js
   create server/api/client/index.spec.js
   create server/api/client/client.controller.js
   create server/api/client/client.events.js
   create server/api/client/client.integration.js
   create server/api/client/client.model.js
   create server/api/client/client.socket.js