Dancer::Plugin::Auth::Extensible::Unix - authenticate *nix system accounts
An authentication provider for Dancer::Plugin::Auth::Extensible which
authenticates Linux/Unix system accounts.
Uses Unix::Passwd::File to read user details, and Authen::Simple::PAM to perform
authentication via PAM.
The "get_user_details" call for this provider will return information
from the "passwd" file - expect "gecos", "gid",
"uid", "home", "shell", "uid".
Unix group membership is used as a reasonable facsimile for roles - this seems