text: Title: Visualizer for Missing Values Patterns
  Body: It would be great to visualize missing data in a meaningful format that is easy to understand the patterns around it.
  
  ### Proposal/Issue
  
  A basic implementation of the visualizer would include on the x axis, the labels / features and the y access would include a bar chart of the number of instances of a missing values.
  
  A more advanced implementation of this would still have the x axis be the labels / features, but the range would be some type of order - either the index location or perhaps a datetime. Each missing value would be shown in a meaningful way potentially similar to this [visualization in this blog post](https://blogs.sas.com/content/iml/2017/11/29/visualize-patterns-missing-values.html):
  
  ![missinggraphics3-1](https://user-images.githubusercontent.com/2944777/37850815-fafb1812-2eb2-11e8-8069-ab86ed66490b.png)
  
  
  