Add 'pretty'  option to ConfigParser output

ConfigParser().dump(pretty=True) / ConfigParser().write_to_ssh_config(pretty=True) results in entry keys getting titlecased and separated by newlines, i.e.:

	Host myhost
		Hostname localhost
		User iamauser
		Port 1234
Please revert this change and add the following line to "add" and "update" commands in `storm/__main__.py`:

```py
@arg('pretty', '--pretty', action='store_true', default=False)
```

See https://github.com/emre/storm/pull/92 for a related patch.