* Name the VMs something friendlier than the vagrant default name
* Enable multiple CPUs on master node
* Added public network interface
Added configurable environment variable to set to memory size of each
agent VM
Added bridged public network to agent VMs
Added support for agent memory size.  Fixed the rsync backup command
to prevent never-ending backups.  Added a new process for emitting
the student VM ssh commands at the end of the run.