title: NPM install dependency problems: code EPEERINVALID
body: <p>I have an installation problem</p>
  
  <pre><code>npm ERR! Windows_NT 6.1.7601
  npm ERR! argv "d:\\Program Files\\nodejs\\node.exe" "d:\\Program Files\\nodejs\\
  node_modules\\npm\\bin\\npm-cli.js" "install" "bootstrap-datetimepicker" "--save
  -dev"
  npm ERR! node v0.12.4
  npm ERR! npm  v2.11.1
  npm ERR! code EPEERINVALID
  
  npm ERR! peerinvalid The package grunt does not satisfy its siblings' peerDepend
  encies requirements!
  npm ERR! peerinvalid Peer grunt-contrib-nodeunit@0.3.3 wants grunt@~0.4.0
  npm ERR! peerinvalid Peer grunt-contrib-watch@0.6.1 wants grunt@~0.4.0
  npm ERR! peerinvalid Peer grunt-contrib-jshint@0.10.0 wants grunt@~0.4.0
  </code></pre>