Release v3.0.0

Remove sshd_config_sendenv_xmodifiers parameter which introduced a bug
that would prevent sshd from running.

Change default behvior of sshd to permit root to login. This is done to
be in line with the standard default of sshd. If you want to block root
from logging in by default, set the following in hiera.

ssh::permit_root_login: false
Merging v3.0.0 into master
Merge pull request #33 from ghoneycutt/three_oh

Release v3.0.0