Update 12.04 logic to handle outdated apt cache on distro
Remove EOL Ubuntu 12.10
Added builds for Parallels Desktop for Mac.
Update Travis build to Packer 0.7.1, so the Parallels desktop builds pass.
Fix erroneous virtualbox output directory for vmware-iso build
Fix packer validation failures.
Bump version from 11.1 to 11.2. Increase memory to meet minimum
requirements. Use ~vagrant instead of hardcoded /home/vagrant to
deal with peculiarities of OSes like Solaris for where the home
directories are placed by default (/export/home versus /home)