title: Plot percentiles using matplotlib
body: <p>I have three dataframes df1, df2 and df3. I combine these into one dataframe df. Now i want to find the min, 5 percentile, 25 percentile, median, 90 percentile and max for each date in the dataframe and plot it (line graph for each date) where X axis has the percentiles and Y axis has the values.</p>
  
  <pre><code>df1
      date          value
  0   2017-11-06    10.20
  1   2017-11-06    40.20
  2   2017-11-06    35.10
  3   2017-11-06    90.45
  4   2017-11-06    60.23
  
  df2
      date          value
  1   2017-11-07    110.20
  2   2017-11-07    500.26
  3   2017-11-07    200.16
  4   2017-11-07    350.01
  5   2017-11-07    89.20
  
  df3
      date          value
  1   2017-11-08    101.45 
  2   2017-11-08    160.34
  3   2017-11-08    41.54
  4   2017-11-08    192.42
  5   2017-11-08    111.12
  
  
  df
  
      date          value
  0   2017-11-06    10.20
  1   2017-11-06    40.20
  2   2017-11-06    35.10
  3   2017-11-06    90.45
  4   2017-11-06    60.23
  5   2017-11-07    110.20
  6   2017-11-07    500.26
  7   2017-11-07    200.16
  8   2017-11-07    350.01
  9   2017-11-07    89.20
  10  2017-11-08    101.45 
  11  2017-11-08    160.34
  12  2017-11-08    41.54
  13  2017-11-08    192.42
  14  2017-11-08    111.12
  </code></pre>