title: Node package ( Grunt ) installed but not available
body: <p>I'm trying to build a <a href="https://github.com/jquery/jquery-ui">github jquery-ui library</a> using <code>grunt</code>, but after running <code>npm install</code> I still can't run the command according to the <a href="https://github.com/jquery/jquery-ui#building-jquery-ui">readme file</a>.  It just gives <code>No command 'grunt' found</code>:</p>
  
  <pre><code>james@ubuntu:~/Documents/projects/ad2/lib/jquery-ui$ grunt build
  No command 'grunt' found, did you mean:
   Command 'grun' from package 'grun' (universe)
  grunt: command not found
  james@ubuntu:~/Documents/projects/ad2/lib/jquery-ui$ npm ls
  jquery-ui@1.9.0pre /home/james/Documents/projects/ad2/lib/jquery-ui
  ├─┬ grunt@0.3.9 
  │ ├── async@0.1.18 
  │ ├── colors@0.6.0-1 
  │ ├─┬ connect@1.8.7 
  │ │ ├── formidable@1.0.9 
  │ │ ├── mime@1.2.5 
  │ │ └── qs@0.5.0 
  │ ├── dateformat@1.0.2-1.2.3 
  │ ├─┬ glob-whatev@0.1.6 
  │ │ └─┬ minimatch@0.2.4 
  │ │   └── lru-cache@1.0.6 
  │ ├─┬ gzip-js@0.3.1 
  │ │ ├── crc32@0.2.2 
  │ │ └── deflate-js@0.2.2 
  │ ├── hooker@0.2.3 
  │ ├─┬ jshint@0.5.9 
  │ │ ├── argsparser@0.0.6 
  │ │ └─┬ minimatch@0.2.4 
  │ │   └── lru-cache@1.0.6 
  │ ├─┬ nodeunit@0.6.4 
  │ │ ├── tap-assert@0.0.10 
  │ │ └─┬ tap-producer@0.0.1 
  │ │   ├── inherits@1.0.0 
  │ │   ├── tap-results@0.0.2 
  │ │   └── yamlish@0.0.5 
  │ ├─┬ nopt@1.0.10 
  │ │ └── abbrev@1.0.3 
  │ ├─┬ prompt@0.1.12 
  │ │ ├── pkginfo@0.2.3 
  │ │ └─┬ winston@0.5.11 
  │ │   ├── eyes@0.1.7 
  │ │   ├─┬ loggly@0.3.11 
  │ │   │ └── timespan@2.2.0 
  │ │   └── stack-trace@0.0.6 
  │ ├── semver@1.0.13 
  │ ├─┬ temporary@0.0.2 
  │ │ └── package@1.0.0 
  │ ├── uglify-js@1.0.7 
  │ ├── underscore@1.2.4 
  │ └── underscore.string@2.1.1 
  ├── grunt-compare-size@0.1.4 
  ├─┬ grunt-css@0.2.0 
  │ ├── csslint@0.9.8 
  │ └── sqwish@0.2.0 
  ├── grunt-html@0.1.1 
  ├── request@2.9.153 
  ├─┬ rimraf@2.0.1 
  │ └── graceful-fs@1.1.8 
  └─┬ testswarm@0.2.2 
    └── request@2.9.202 
  </code></pre>
  
  <p>I'm confused, what am I missing please?</p>