title: Colorbar offsetText (scientific base multiplier) move from top to bottom of colorbar
body: <p>I'm losing my wits here with this 'simple' problem:</p>
  
  <p>In the colorbar (illustrated in picture) in matplotlib I need to move offsetText (base multiplier) from top of the colorbar to bottom.</p>
  
  <p>Code that I'm using for this plot is (using gridspec):</p>
  
  <pre><code>f.add_subplot(ax12)
  
  ax10 = plt.Subplot(f, gs00[1, 0])
  cb = plt.colorbar(h3,cax=ax10)
  cb.formatter.set_scientific(True)
  cb.formatter.set_powerlimits((0,0))
  cb.ax.yaxis.offsetText.set(size=6)
  cb.update_ticks()
  
  ax10.yaxis.set_ticks_position('left')
  ax10.tick_params(labelsize=6)
  f.add_subplot(ax10)
  </code></pre>
  
  <p>Thanks in advance!
  (Btw, Python version = 2.7.6, matplotlib version = 1.3.1 - upgrading currently not an option until I finish current project)</p>
  
  <p><a href="https://i.stack.imgur.com/nRFMF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nRFMF.png" alt="enter image description here"></a></p>