title: The term 'Install-Module' is not recognized as the name of a cmdlet
body: <p>I am following the directions to install <a href="https://github.com/dahlbyk/posh-git">poshgit</a>.  In doing so I ran:</p>
  
  <p><code>Install-Module posh-git</code></p>
  
  <p>Error:</p>
  
  <blockquote>
    <p>The term 'Install-Module' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and t
    ry again.</p>
  </blockquote>
  
  <p>I ran <code>$PSVersionTable.PSVersion</code>: result = <code>2.0.-1.-1</code></p>
  
  <p>Is <code>Install-Module</code> an addon?  How can I run this command?</p>