Hi,
I'm been using Strapi for a project I'm doing and you guys have done a great work! I love the idea.
This is a small Pull Request, however, I find it very useful if you would like to have your global policies organized by folders. Just in case you have more than 10 of them.
If you try at the moment to create a policy inside a folder, it will throw
```
Cannot read property 'handler' of undefined
```
This will fix it and it will allow you to have folders on your `config/policies` folder.
