code: function read (path) {
    return function (done) {
      fs.createReadStream(resolve(__dirname, path))
        .pipe(concat(function (data) {
          done(null, data.toString())
        }))
    }
  }
docs: Read a source (return an async reader function)
  
  @param  {String} path
  Relative source path
  
  @return {Function}
  Function for async.js