title: Frappe installation error "AttributeError: module 'pyparsing' has no attribute 'downcaseTokens'"
body: <p>When I install frappe ( version-13 ) on linux</p>
  <p>when I run <code>bench init</code></p>
  <p>it gives an error</p>
  <blockquote>
  <p>ERROR: httplib2 0.20.1 has requirement pyparsing&lt;3,&gt;=2.4.2, but you'll have pyparsing 3.0.0 which is incompatible.</p>
  </blockquote>
  <p>though the installation goes through.</p>
  <p>After that when a new site is created it gives an error</p>
  <blockquote>
  <p>AttributeError: module 'pyparsing' has no attribute 'downcaseTokens</p>
  </blockquote>
  <p>which is a deprecated function not available in version 3.0 but available in 2.4.2</p>
  <p>How do I get around this issue ? Can I force install an earlier version of pyparsing ?</p>
  <p>Regards
  Hari</p>