Major Features and Improvements

• Added -i/--install CLI argument and install argument to deeppavlov.build_model, deeppavlov.evaluate_model, deeppavlov.train_model to install model requirements before interaction with model (#1603).

Bug Fixes and Other Changes

• Reduced library verbosity: redundant logging info messages replaced with debug ones. Set nltk.download to quiet mode. (#1601).
• Replaced docs/features/models/classifiers.rst with docs/features/models/classification.ipynb. Fixed minor typos in documentation, removed skill concept (#1600).
• Removed /examples from the README.md links (#1602).