title: Saving plot from seaborn
body: <p>When I try to save my plot working with seaborn, like this:</p>
  
  <pre><code>import seaborn as sn
  import pandas as pd
  import matplotlib.pyplot as plt
  from pylab import savefig
  
  array = [[100,0], 
          [33,67]]
  
  df_cm = pd.DataFrame(array)
  
  svm = sn.heatmap(df_cm, annot=True,cmap='coolwarm', linecolor='white', linewidths=1)
  
  svm.savefig('svm_conf.png', dpi=400)
  </code></pre>
  
  <p>I get this error </p>
  
  <pre><code>AttributeError                            Traceback (most recent call last)
  &lt;ipython-input-71-5c0ae9cda020&gt; in &lt;module&gt;()
  ----&gt; 1 svm.savefig('svm_conf.png', dpi=400)
  
  AttributeError: 'AxesSubplot' object has no attribute 'savefig'
  </code></pre>
  
  <p>I have saved some boxplots before, with the same code, but this time, it doesn't work. </p>