Version 3.2.1

This is a minor release that includes one new feature:

• allow IPv4 addresses in host spec

v3.2.0

Update to include previously un-released enhancements:

• Move old --quiet functionality to --no-header and forward --quiet to ssh command.
• Add --input option to allow piping input to remote command.
• Add --ok option to only display output from commands that succeeded.
• Support user-defined host attributes in addition to auto-defined :UP.
• Allow group names to have aliases.
• Allow groups to be defined after inclusion in a previous group.
• Toggle output color between hosts.

v3.0.0

Fix error in documentation.