[a·bout] No doubt, vagrant is a great timesaver when it comes to the integation workflow. Setting up a JeOS for development purpose was a timeconsuming process before I discovered vagrant. Each box and its setup is now defined through its configuration file and its Chef recipes. In doubt of a 'unclean' or 'broken' OS, I simply check out my cookbook and my vagrant config and vagrant up. [ob·jec·tives] Since I did this very often, I felt it very anoying to apt-get uppdate and upgrade all over again to end with a up-to-date system. I wanted a VM…