Added phpMyAdmin integration fixes #31

* fixes #31
* one new puppet module from myself which installs phpMyAdmin (frastel/puppet-phpmyadmin)
* This module provides a custom facter and with additional facts it is possible to avoid using passwords directly in the manifests. The credentials are injected via Vagrantfile (see shell provisioning). I tested it on apache and nginx boxes. 
* phpMyAdmin is always reachable under http://phpmyadmin
* I also added the needed location directive to the nginx vhost which is currently missing in the xhprof vhost. c&p would help to fix #33
* Currently one could only define if phpMyAdmin should be installed (if root password is set) or not. No further configuration supported at the moment.