title: Error installing middleman: The 'fast_blank' native gem requires installed build tools
body: <p>Can some one help me to solve this above issue i'm using windows 8.1 
  trying to install middleman from command line  ?
  By following this tutorial ?
  <a href="https://github.com/middleman/middleman" rel="nofollow">https://github.com/middleman/middleman</a> </p>
  
  <p>C:>gem install middleman</p>
  
  <p><strong>after some successfull installation</strong> </p>
  
  <p>ERROR:  Error installing middleman:
          The 'fast_blank' native gem requires installed build tools.</p>
  
  <p>Please update your PATH to include build tools or download the DevKit
  from 'link'
  at 'link'</p>
  
  <p>C:></p>