title: pandas.DataFrame: .hist() vs .plot.hist() methods
body: <p>On <code>pandas.DataFrame</code> in 0.19 there are two hist methods:</p>
  
  <p><a href="http://pandas.pydata.org/pandas-docs/version/0.19.0/generated/pandas.DataFrame.hist.html" rel="noreferrer">DataFrame.hist</a></p>
  
  <p><a href="http://pandas.pydata.org/pandas-docs/version/0.19.0/generated/pandas.DataFrame.plot.hist.html" rel="noreferrer">DataFrame.plot.hist</a></p>
  
  <p>At first I thought they were the same, but actually they take different arguments. Is one going to be deprecated in a future release, is there a different use case for each, or what's the story?</p>