artifactory 3.3.1 (new formula)

This is a new formula for the Artifactory Open Source Binary repository by JFrog.com. It is a competitor of nexus, which is already part of Homebrew. 
Anything you can call with a `0` exit status? Normally `1` indicates an error so it would be good if we could ensure that we're running a command successfully? The format is pretty good though!