Include 'last_checkin' in the node details
Hide add'l details from command help text

The command help was erroneously including
the text used to tell the user how to dive deeper
into a collection. This hides that text.

Fixes https://tickets.puppetlabs.com/browse/RAZOR-269
Allow spaces in names

The previous regex wasn't grouping the `--name="a b"` case properly; this rectifies that.

Fixes https://tickets.puppetlabs.com/browse/RAZOR-257