Bring back the Download code as before (and simplify the ssh key gen to be more like before)
Merge pull request #233 from SvenDowideit/refactor-lost-iso-download-for-init

Bring back the Download code as before (and simplify the ssh key gen to ...
Update machine.go
max cpu cap of 32
Merge pull request #238 from doug/master

virtualbox has a 32 cpu hard limit