title: Update npm module, but showing different older version in my console window
body: <p>I wanted to install the latest version of socket.io, and the latest ver seems to be 1.45.<a href="http://socket.io/download/" rel="nofollow">socket.io download</a></p>
  
  <p>To do this, I just type the following command.</p>
  
  <p><code>
  npm install socket.io
  </code></p>
  
  <p>However, when I checked installed modules in my laptop, socket.io's version did not change as can be seen below.
  <code>
  YANAGISAWAYUMA-no-MacBook-Pro:~ yanagisawa_yuma$ npm list --depth=0
  yanagisawa_yuma@0.0.0 /Users/yanagisawa_yuma
  ├── ar-drone@0.3.3 extraneous (git://github.com/felixge/node-ar-drone.git#228bd4573e765bed3861f259ce7e66fcace15f43)
  ├── express@4.9.0
  ├── gulp@3.9.0
  ├── node@0.0.0
  ├── node-osc@1.1.0 extraneous
  ├── node-static@0.7.3
  ├── socket.io@1.1.0
  └── static@2.0.0
  </code></p>
  
  <p>What am I missing?</p>