Group functionality together with on/off switch

Prior to this commit, you had little control over the content put
into the /etc/motd file. This commit groups content into puppet_info
and hardware_info as class parameters, defaulting to true. Still to
come is a way for the user to express their own MOTD.
Update Modulefile for 1.2.0
Merge pull request #1 from rcoleman/groupings

Groupings