Bug fixes, and amends.

Resolved the connection issue where Ansible complained of not being able to find an SSH host. This is was due to Ansible/SSH checking the host key against known_hosts, and failing due to a pre-existing entry for localhost.

Added the line 'ansible.host_key_checking = "false"' to Vagrantfile

Removed ansible_hosts. Vagrant creates it's own ansible inventory file, based upon what is set in the Vagrantfile.

Also updated the RPM Fusion play to include a line to create the ${rpm-folder}. Was failing due to the directory not existing.

Added further entries to the credits section.

modified:  	./Vagrantfile
removed: 	provisioning/ansible_hosts
modified:  	provisioning/playbook.yml
modified:  	provisioning/roles/common/tasks/rpmfusion.yml
modified:  	slides/presentation/notes.md