Shap

- Fixes an issue in DeepExplainer caused by a change in TensorFlow 1.14.

Various bug fixes and improvements including:

- adding SHAP values for binary classification to CatBoost courtesy of dvpolyakov
- Integer division fix for plots courtesy of pmeier-tiplu
- Support passing in an Axes object to dependence_plot courtesy of mqk
- Add adaptive average pooling and conv transpose layers courtesy of of gabrieltseng
- fix import errors on a missing matplotlib backend courtesy of hchandola
- fix TreeExplainer GradientBoostingClassifier bug courtesy of prempiyush
- make tqdm play nicer with notebooks courtesy of KOLANICH
- Allow deep_pytorch to use cuda models courtesy of juliusbierk
- Fix sklearn GradientBoostingRegressor bug courtesy of nasir-bhanpuri
- adding sparse support to shap linear explainer courtesy of imatiach-msft

Fixes to support changes in the most recent version of sklearn

A few contribution highlights of this release (in chronological order)
- Better testing courtesy of jorgecarleitao
- Image plot customizations courtesy of verdimrc
- Batch norm support for PyTorch in DeepExplainer courtesy of JiechengZhao
- Leaky ReLU and other conv layer support for pytorch deep explainer courtesy of gabrieltseng
- Fixed keras multi input in gradient explainer and improved random seeds courtesy of moritzaugustin
- Support for catBoost ranker courtesy of doramir
- Added XGBRanker and LGBMRanker to TreeExplainer courtesy of imatiach-msft
- Fix embedding lookup with tf.keras in DeepExplainer courtesy of andriy-nikolov
- Custom dependence_plot colors maps courtesy of rcarneva
- Fix divide by zero issues possible with CatBoost models courtesy of dvpolyakov
- Lots of other bug fixes/improvements!

This release is just to refresh the Windows builds on AppVeyor that didn't complete for 0.28.4

- Fixes memory corruption error from TreeExplainer (courtesy of imatiach-msft)
- Adds support for skopt Random Forest and ExtraTrees Regressors (courtesy of Bacoknight)
- Adds support for matplotlib forceplot with text rotation (courtesy of vatsan)
- Adds a save_html function