grunt-pause 
grunt-pause allows you to pause the grunt task runner between tasks. You can then choose whether or not to continue running the remaining tasks or clear the task queue.
Getting started
Install grunt-pause
npm install grunt-pause ## --save-dev
Upgrade your Gruntfile.js
Add the grunt-pause reference to the very top of your Gruntfile.js:
var pause = require("grunt-pause");
Add the pause init call at the top of the module.exports function:
module.exports = function (grunt) {
pause.init(grunt);