title: Why Yeoman is not present after i installed it?
body: <p>I try to install yeoman but it's not working :</p>
  
  <pre><code>npm install -g yo 
  
  /Users/john/npm/bin/yo-complete -&gt; /Users/john/npm/lib/node_modules/yo/lib/completion/index.js
  /Users/john/npm/bin/yo -&gt; /Users/john/npm/lib/node_modules/yo/lib/cli.js
  &gt; yo@2.0.1 postinstall /Users/john/npm/lib/node_modules/yo
  
  &gt; yodoctor
  
  Yeoman Doctor
  
  Running sanity checks on your system
  
  ✔ Global configuration file is valid
  ✔ Node.js version
  ✔ No .bowerrc file in home directory
  ✔ No .yo-rc.json file in home directory
  ✔ npm version
  ✔ NODE_PATH matches the npm root
  Everything looks all right!
  + yo@2.0.1
  updated 1 package in 11.935s
  </code></pre>
  
  <p>john$ <code>yo --version</code></p>
  
  <p>-bash: /usr/local/bin/yo: No such file or directory</p>