Use the presence of pio-start-all command as installed flag#7

duksis wants to merge 1 commit intoPredictionIO:masterPredictionIO/PredictionIO-Vagrant:masterfrom

mindmatch:use-presence-of-command-as-installed-checkmindmatch/PredictionIO-Vagrant:use-presence-of-command-as-installed-checkCopy head branch name to clipboard