Add lxmx_hostname, update spec + Berksfile

+ use Bershelf for newrelic
Merge pull request #30 from Rud5G/add-lxmx_hostname

Add lxmx_hostname, update spec + Berksfile
Update attributes, version + Vagrantfile
Merge pull request #31 from Rud5G/add-lxmx_hostname

Update attributes, version + Vagrantfile