I've just submitted a pull request for a Juno Homebrew cask, and it has already been merged! Installing Juno on OSX can now be done with
brew cask install juno
Oh wow, neat! Thanks for that.
Tiny note: Light Table (and Juno by extension) are now MIT licensed. Although I should really update the plugin licenses as well.
I got the GPL stuff from http://junolab.org/about. I'll update the cask when you've updated the website and packages.