docker/fig — pull request #486 by acaranta (2014-09-16 17:08:31+00:00)
Title: Multiple external ports bound to a single internal port

Hi !

As I tested fig for my containers I realized that when using for ports declaration the following configuration :
```
ports:
- "80:80"
- "5000:80"
```

Only the last binding was used.
It it due to the way the port_bindings dict is filled.
I changed that to allow this kind of configuration to work.