Document CentOS 7.0 box. Fixes #260.
Merge pull request #262 from juliandunn/centos-7

Document CentOS 7.0 box.
Update 12.04 logic to handle outdated apt cache on distro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.
Remove EOL Ubuntu 12.10.
Merge pull request #265
Fix erroneous virtualbox output directory for vmware-iso build
Merge pull request #267 from eshamow/solaris_10_fixes

Fix erroneous virtualbox output directory for vmware-iso build