title: `npm run gulp` can not find module 'gulp-shell'?
body: <p>I've deleted <code>node modules</code> folder and installed npm using <code>npm install</code> command. My <code>gulpfile.js</code> is also perfect because other people are working perfectly with this config, even I did with this config from my another machine. But when I try to run <code>npm run gulp</code> from current machine it shows below errors.</p>
  
  <pre><code>Fahads-MacBook-Pro:dark-web jim$ npm run gulp
  
  &gt; jetaport@1.0.0 gulp /Users/jim/Documents/JETAPORT/dark-web
  &gt; gulp
  
  module.js:327
      throw err;
      ^
  
  Error: Cannot find module 'gulp-shell'
      at Function.Module._resolveFilename (module.js:325:15)
      at Function.Module._load (module.js:276:25)
      at Module.require (module.js:353:17)
      at require (internal/module.js:12:17)
      at Object.&lt;anonymous&gt; (/Users/jim/Documents/JETAPORT/dark-web/gulpfile.js:6:13)
      at Module._compile (module.js:409:26)
      at Object.Module._extensions..js (module.js:416:10)
      at Module.load (module.js:343:32)
      at Function.Module._load (module.js:300:12)
      at Module.require (module.js:353:17)
  
  npm ERR! Darwin 14.5.0
  npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "run" "gulp"
  npm ERR! node v4.4.2
  npm ERR! npm  v2.15.0
  npm ERR! code ELIFECYCLE
  npm ERR! jetaport@1.0.0 gulp: `gulp`
  npm ERR! Exit status 1
  npm ERR! 
  npm ERR! Failed at the jetaport@1.0.0 gulp script 'gulp'.
  npm ERR! This is most likely a problem with the jetaport package,
  npm ERR! not with npm itself.
  npm ERR! Tell the author that this fails on your system:
  npm ERR!     gulp
  npm ERR! You can get information on how to open an issue for this project with:
  npm ERR!     npm bugs jetaport
  npm ERR! Or if that isn't available, you can get their info via:
  npm ERR! 
  npm ERR!     npm owner ls jetaport
  npm ERR! There is likely additional logging output above.
  
  npm ERR! Please include the following file with any support request:
  npm ERR!     /Users/jim/Documents/JETAPORT/dark-web/npm-debug.log
  </code></pre>
  
  <p>And here is the <code>package.json</code> file</p>
  
  <pre><code>{
    "name": "jetaport",
    "version": "1.0.0",
    "description": "The Jetaport Gulp dependencies.",
    "main": "index.js",
    "author": "Alexander Khost",
    "repository": {
      "type": "git",
      "url": "git://github.com/akhost/Jetaport.git"
    },
    "license": "ISC",
    "dependencies": {
      "autoprefixer": "^6.3.1",
      "babel-preset-es2015": "^6.3.13",
      "babel-preset-react": "^6.3.13",
      "bower": "^1.7.2",
      "gulp": "^3.9.0",
      "gulp-autoprefixer": "^3.1.0",
      "gulp-cssnano": "^2.0.0",
      "gulp-imagemin": "^2.4.0",
      "gulp-postcss": "^6.0.1",
      "imagemin-pngquant": "^4.2.0",
      "laravel-elixir": "^5.0.0",
      "pixrem": "^3.0.0",
      "postcss-conditionals": "^2.0.0",
      "postcss-each": "^0.9.1",
      "postcss-import": "^7.1.3",
      "postcss-math": "0.0.1",
      "postcss-mixins": "^4.0.1",
      "postcss-nested": "^1.0.0",
      "postcss-reporter": "^1.3.0",
      "postcss-scss": "^0.1.3",
      "postcss-simple-extend": "^1.0.0",
      "postcss-simple-vars": "^1.1.0",
      "precss": "^1.3.0",
      "yargs": "^4.4.0"
    },
    "bugs": {
      "url": "https://github.com/akhost/Jetaport/issues"
    },
    "homepage": "https://github.com/akhost/Jetaport#readme",
    "directories": {
      "test": "tests"
    },
    "devDependencnpm ies": {
      "gulp-notify": "^2.2.0"
    },
    "scripts": {
      "gulp": "gulp",
      "bower": "bower"
    },
    "devDependencies": {
      "gulp": "^3.9.1"
    }
  }
  </code></pre>