Merge pull request #22 from drybjed/master

Changes in dotfile configuration in 'users' role
Add 'phpipam' role

phpIPAM is a PHP5 IP address manager (http://phpipam.net/). Its database
will be used as a data source for DHCP servers in ginas.
Merge pull request #23 from drybjed/role/phpipam

Add 'phpipam' role