title: npm outdated and npm update doesn't work
body: <p>I want to check if my modules are Latest</p>
  
  <p>i do: <code>sudo npm outdated</code></p>
  
  <p>and I have this results</p>
  
  <pre><code>Package              Current  Wanted  Latest  Location
  
  oauth                  0.9.9   0.9.9  0.9.10  twit &gt; oauth
  require-all            0.0.3   0.0.3   0.0.8  mysql &gt; require-all
  bignumber.js           1.0.1   1.0.1   1.3.0  mysql &gt; bignumber.js
  request               2.27.0  2.27.0  2.30.0  facebook-chat &gt; node-xmpp &gt; node-xmpp-client &gt; request
  through                2.2.7   2.2.7   2.3.4  facebook-chat &gt; node-xmpp &gt; brfs &gt; through
  </code></pre>
  
  <p>then i do this:<code>sudo npm update</code>
  but if I repeat <code>sudo npm outdated</code> i have the same results...
  also if I do for example
  Info:</p>
  
  <pre><code>Package              Current  Wanted  Latest  Location
  oauth                  0.9.9   0.9.9  0.9.10  twit &gt; oauth
  </code></pre>
  
  <p>Then Update</p>
  
  <pre><code>sudo npm update oauth
  </code></pre>
  
  <p>Then</p>
  
  <pre><code>sudo npm outdated oauth
  </code></pre>
  
  <p>My Result:</p>
  
  <pre><code>Package  Current  Wanted  Latest  Location
  oauth      0.9.9   0.9.9  0.9.10  twit &gt; oauth
  </code></pre>