internal…

pulse-till-done.js
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			'use strict'
			var validate = require('aproba')
			var log = require('npmlog')

			var pulsers = 0
			var pulse

			module.exports = function (prefix, cb) {
			validate('SF', [prefix, cb])
			if (!pulsers++) {
			pulse = setInterval(function () {
			log.gauge.pulse('network')
			}, 250)
			}
			return function () {
			if (!--pulsers) {
			clearInterval(pulse)
			}
			cb.apply(null, arguments)
			}
			}