title: 'yeoman' is not recognized as an internal or external command, operable program or batch file
body: <p>I am trying to learn angularjs, in between i came across yeoman, So i tried installing yeoman, 
  I refered : <a href="http://decodize.com/css/installing-yeoman-front-end-development-stack-windows/" rel="nofollow">http://decodize.com/css/installing-yeoman-front-end-development-stack-windows/</a>
  at the line "There are 2 method to install Yeoman.", i followed "a." And installed by</p>
  
  <p>Command prompt: 
  D:\Angular_Work_Space>npm install yeoman</p>
  
  <p>after downloading all the packages, i could able to see the node_modules/ folder in 'Angular_Work_Space', </p>
  
  <p>So after this, i tried, 
  D:\Angular_Work_Space>yeoman init</p>
  
  <p>got error: 
  <strong>'yeoman' is not recognized as an internal or external command,
  operable program or batch file.</strong></p>
  
  <p>please tell me what i have missed on what else to do.</p>