Fix #10

```yo m:collection todos``` will now ask you
```
[?] Should i create a model 'todo' for you? (Ynrh)
  y) Yes please
  n) No thanks, just a collection
   r) I want to rename the model name
   h) Help, list all options
```

It's also possible with one command  ```yo m:collection todos todo```

Produces:
 ```
app/scripts/collections/todos.js
app/scripts/models/todo.js
```