ENH: added --info argument to print info on the current token:
ENH: added --info argument to print info on the current token:

For example:
```bash
binstar -t $TOKEN auth --info
Name: my-token
Id: 5301459e7d150a5af963XXXX
```

This is a part of the solution for issue #Binstar/binstar.org#15

Anaconda-Platform/anaconda-client,Anaconda-Platform/anaconda-client,Anaconda-Platform/anaconda-client