Bumped default number of VM CPUs to 2
CPU & memory allocation can now be set to "auto"

vm_cpus: "auto" # Allocatate all available cores on host
vm_memory: "auto" # Allocate 1/4 memory available on host

Should work with VMWare too but haven't been able to test.

Hat tip for the Mac/Linux system stats code:
http://www.stefanwrobel.com/how-to-make-vagrant-performance-not-suck