add ability to "brew install cuttle" on a mac

[oakmac]

[oakmac]

@LesleyMdCampo - do you want to learn how to make brew packages? Looks like it involves Ruby in some capacity.

[shaunlebron]

brew is for command line apps since it installs things to /usr/local. Homebrew Cask is more our style since it installs to /Applications. Seems pretty simple if we want to go that route.

[LesleyMdCampo]

ok, on it.

[LesleyMdCampo]

submitted a pull request with homebrew-cask: Homebrew/homebrew-cask#10184