title: matplotlib colorbar placement and size
body: <p>I'm using <code>quadmesh</code> to create a simple polar projection plot.  Here's a minimal script which produces basically what I'm trying to do:</p>
  
  <pre><code>from __future__ import unicode_literals
  import numpy as np
  import matplotlib.pyplot as plt
  
  def make_plot(data,fig,subplot):
      nphi,nt = data.shape
      phi_coords = np.linspace(0,np.pi*2,nphi+1) - np.pi/2.
      theta_coords = np.linspace(0,np.radians(35),nt+1)
  
      ax = fig.add_subplot(subplot,projection='polar')
      ax.set_thetagrids((45,90,135,180,225,270,315,360),(9,12,15,18,21,24,3,6))
      ax.set_rgrids(np.arange(10,35,10),fmt='%s\u00b0')  
  
      theta,phi = np.meshgrid(phi_coords,theta_coords)
      quadmesh = ax.pcolormesh(theta,phi,data)
      ax.grid(True)
      fig.colorbar(quadmesh,ax=ax)
      return fig,ax
  
  
  a = np.zeros((360,71)) + np.arange(360)[:,None]
  b = np.random.random((360,71))
  fig = plt.figure()
  t1 = make_plot(a,fig,121)
  t2 = make_plot(b,fig,122)
  fig.savefig('test.png')
  </code></pre>
  
  <p>The above script creates a plot which looks like this:</p>
  
  <p><img src="https://i.stack.imgur.com/xaI7f.png" alt="enter image description here"></p>
  
  <p>I would like the colorbars to:</p>
  
  <ol>
  <li>Not overlap the 6 label.</li>
  <li>be scaled such that they are approximately the same height as the plot.</li>
  </ol>
  
  <p>Is there any trick to make this work properly?  (Note that this layout isn't the only one I will be using -- e.g. I might use a 1x2 layout, or a 4x4 layout ... It seems like there should be some way to scale the colorbar to the same height as the associated plot...)</p>