v6.5.1: Improved linear class and Windows fix

✨ Major features and improvements

• Add hash kernel linear class.

🔴 Bug fixes

• Fix issue #22: Remove random_bytes method from Ops.
• Fix termcolor dependency.

📖 Documentation and examples

• Add IMDB to datasets.
• Add linear BOW example, using hash kernel.

👥 Contributors

Thanks to @rolando and @ogrisel for the pull requests!