Coffee complication that maintains whole directory and file structure
npm install --save-dev laravel-elixir-coffeedir
method: coffeedir
arguments: source, destination, options
eg:
.coffeedir('some/folders/to/compile/**/*.coffee', 'where/you/want/it/to/go/')
source default is {config.assetsDir}coffee/**/*.coffee
desination default is {config.jsOutput}
options are passed directly to the gulp-coffee task