Update examples.ipynb to include new Visualizers

I noticed that the examples.ipynb was out-of-date.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)

• 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')

• Fix issue #436 as it partially addresses some of these concerns.

@DistrictDataLabs/team-oz-maintainers

[Kautumn06]

If no one else is working on this, I’d be happy to start making some of the updates that Larry suggested.

@DistrictDataLabs/team-oz-maintainers

[chalmerlowe]

Unless someone else is gonna dive into this, I plan on cleaning up the example notebooks:

• break up some of the examples from the main example.ipynb in a manner similar to @Kautumn06’s breakup of examples into separate notebooks.
• gonna start on pulling out the text visualizer example.