Expanded view in docker ps

Hi, 

Usually I work with splits on my terminal, and the `docker ps` output is extremely long for them which makes it unreadable.

Today we (@agonzalezro and me) made a quick fix in the `CmdPs` function to add the `-x` (`--expanded`) option to get an output like this: 

```
âžœ  docker git:(master) ./bundles/1.3.2-dev/binary/docker ps -a -x
- [ 6e73b3ce8098 ] -+----------------------------------------------------------
Container_id        | 6e73b3ce8098
Image               | ubuntu:14.04
Command             | "sleep 10000"
Created             | 3 hours ago
Status              | Exited (-1) 2 hours ago
Ports               | 0.0.0.0:1025->80/tcp
Name                | modest_nobel
- [ ef78c54845c0 ] -+----------------------------------------------------------
Container_id        | ef78c54845c0
Image               | mysql:5
Command             | "/entrypoint.sh mysq
Created             | 5 hours ago
Status              | Exited (1) 5 hours ago
Name                | sad_meitner
- [ 4f82da9cd562 ] -+----------------------------------------------------------
Container_id        | 4f82da9cd562
Image               | 84401c0b05c0
Command             | "/bin/sh -c 'cd /usr
Created             | 6 hours ago
Status              | Exited (-1) 6 hours ago
Name                | dreamy_sinoussi
```

Please, realise that the `Ports` attribute is only shown when it has any value.

Thanks.