Install a Homebrew Formula at Master

We've been testing out the forthcoming Elixir 1.6 formatter on Tilex's codebase, which requires a version of the langage that has not yet been officially released.

There's a few ways to do this. Since Elixir is installed with Homebrew on my machine, here's how to do it with Homebrew:

$ brew install elixir --HEAD

From the Homebrew man page:

If --HEAD is passed, and formula defines it, install the HEAD version, aka master, trunk, unstable.

Welcome to the bleeding edge!

h/t Brian Dunn

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