Unclarities in Wordpress tutorial

Going through the Wordpress tutorial I found some unclarities that required googling / consulting other users:

* The ideas of 'repo', 'template', 'resource' and relationships between them are not explained clearly enough.
* Users trying to run this on libvirt need to search for informations in other documents. It would be good to explain everything about it in the tutorial
* The 'Missing required arguments: libvirt_uri' can be fixed with 'vagrant plugin install --plugin-version 0.0.3 fog-libvirt'
* If someone runs this e.g. on a fresh nfs install, the folders will be incorrectly synced by rsync. One needs to install nfs server and configure vagrant. Also it would be nice to inform about potential problems with nfs (like encrypted dirs)
* It would be good to tell users to always run solar-worker explicitly in another window/tab