title: Rotation argument for scikit-learn's factor analysis
body: <p>One of the hallmarks of factor analysis is that it allows for non-orthogonal latent variables.</p>
  
  <p>In R for example this feature is accessible via the <code>rotation</code> parameter of <a href="https://stat.ethz.ch/R-manual/R-devel/library/stats/html/factanal.html"><code>factanal</code></a>.
  Is there any such provision for <a href="http://scikit-learn.org/stable/modules/generated/sklearn.decomposition.FactorAnalysis.html#sklearn.decomposition.FactorAnalysis"><code>sklearn.decomposition.FactorAnalysis</code></a>? Clearly it's not among the arguments - but maybe there is another way to achieve this?</p>
  
  <p>Sadly I have been unable to find many examples of usage for this function.  </p>