text: Title: Update examples.ipynb to include new Visualizers
  Body: I noticed that the examples.ipynb was out-of-date.  
  Here are the things that need to be changed/updated.
  
  - [ ] Include new visualizers
      - Class Prediction Error
      - CVScores
      - Manifold
      - Feature Importance
      - Recursive Feature Elimination
      - Classification Report w/ support
      - Discrimination Threshold
      - Validation Curve
      - Learning Curve)
  
  - [x]  Remove deprecated Visualizers (e.g ScatterVisualizer)
  
  - [ ]  When the visualizers are executed some of them raise warnings.  For aesthetics of the notebook, we need to turn off all warnings.  See example code below
  
  ```
   import warnings
  warnings.filterwarnings('ignore')
  ```
  
  - [x]  Fix issue #436 as it partially addresses some of these concerns.
  
  
  @DistrictDataLabs/team-oz-maintainers
  