title: npm install 403 issue
body: <p>I am trying to install bower as follow - </p>
  
  <pre><code>$ npm install -g bower or $npm install bower
  
  npm ERR! fetch failed http://registry.npmjs.org/bower/-/bower-1.7.1.tgz
  npm WARN retry will retry, error on last attempt: Error: fetch failed with status code 403
  npm ERR! fetch failed http://registry.npmjs.org/bower/-/bower-1.7.1.tgz
  npm WARN retry will retry, error on last attempt: Error: fetch failed with status code 403
  npm ERR! fetch failed http://registry.npmjs.org/bower/-/bower-1.7.1.tgz
  npm ERR! Linux 4.2.0-16-generic
  npm ERR! argv "/usr/local/bin/node" "/usr/local/bin/npm" "install" "-g" "bower"
  npm ERR! node v0.12.7
  npm ERR! npm  v2.11.3
  npm ERR! fetch failed with status code 403
  npm ERR!
  npm ERR! If you need help, you may report this error at:
  npm ERR!     &lt;https://github.com/npm/npm/issues&gt;
  npm ERR! Please include the following file with any support request:
  npm ERR!     /root/ravi/watson/novus/nvd3/npm-debug.log
  </code></pre>
  
  <p></p>
  
  <p>I already have npm proxy setting in place as shown in example below :</p>
  
  <pre>
  
      npm config list
      ; cli configs
      user-agent = "npm/2.11.3 node/v0.12.7 linux ppc64"
  
      ; userconfig /root/.npmrc
      http-proxy = "https://username:password@:8080/"
      https-proxy = "https://username:password@:8080/"
      proxy = "https://username:password@:8080/"
      registry = "http://registry.npmjs.org/"
      strict-ssl = false
  
      ; node bin location = /usr/local/bin/node
      ; cwd = /root/ravi/watson/novus/nvd3
      ; HOME = /root
      ; 'npm config ls -l' to show all defaults.
  
  
  </pre>