title: Matplotlib timelines
body: <p>I'm looking to take a python DataFrame with a bunch of timelines in it and plot these in a single figure. The DataFrame indices are Timestamps and there's a specific column, we'll call "sequence", that contains strings like "A" and "B". So the DataFrame looks something like this:</p>
  
  <pre><code>+--------------------------+---+
  | 2014-07-01 00:01:00.0000 | A |
  +--------------------------+---+
  | 2014-07-01 00:02:00.0000 | B |
  +--------------------------+---+
  | 2014-07-01 00:04:00.0000 | A |
  +--------------------------+---+
  | 2014-07-01 00:08:00.0000 | A |
  +--------------------------+---+
  | 2014-07-01 00:08:00.0000 | B |
  +--------------------------+---+
  | 2014-07-01 00:10:00.0000 | B |
  +--------------------------+---+
  | 2014-07-01 00:11:00.0000 | B |
  +--------------------------+---+
  </code></pre>
  
  <p>I'm looking for a plot something like this:</p>
  
  <pre><code>B |  *     * **
  A | *  *   *
    +------------
      Timestamp
  </code></pre>