title: Failure to import pyOptSparseDriver
body: <p>I have installed OpenMDAO ver. 1.7.4 &amp; successfully run several tutorial examples. However when issuing the command "from openmdao.api import pyOptSparseDriver" I get the response "ImportError: cannot import name pyOptSparseDriver".</p>
  
  <p>I feel sure that I should be able to import pyOptSparseDriver (&amp; that I have spelled it correctly). I have tried reinstalling OpenMDAO and this seemed to complete without error, but the problem persists.</p>
  
  <p>Could anyone point me in the right direction?</p>
  
  <p>Thanks!</p>