Gemini beefy plugin

Serve your gemini tests with beefy.

Example .gemini.yml that also uses gemini-sauce:

rootUrl: http://127.0.0.1:9966

plugins:
  sauce:
    username:
    accessKey:
  beefy:
    quiet: false
    entries:
      - page.js
    live: false
    watchify: false
    index: page.html
    bundlerFlags: '-p [css-modulesify -o dist/style.css]'

Note: this is experimental and has no tests at the moment. Created for this example.