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. 
Considering https://www.google.com/search?client=safari&rls=en&q=artifactory+documentation&ie=UTF-8&oe=UTF-8 I think that's unnecessary. The more caveats we have the less people read any of them. Please just remove these ones, thanks!