Updating README links
Install to /usr to avoid $PATH problems
Run tests via /vagrant
Rewrite Vagrantfile to multi VM format

This makes it easy to start multiple VMs but also improves debugability
because the VM will be named foreman-bats_centos64 in libvirt as well.
Enable pty over SSH due to EL6 sudoers w/requiretty
Install hammer, check host and proxy are registered
Install yum-config-manager
Merge pull request #6 from domcleal/yum-config

Install yum-config-manager
Allow changing the module path through $MODULE_PATH
Document $MODULE_PATH
Remove ignored dir, as vagrant-rackspace also ignores it
Conditionally set pty, only on RH hosts to avoid hangs