Speed up test and train times with multi-threading.
Add support for random forests.
Clean up duplicated code around extracting features.
Attempt to speed up histogram creation by precomputing bin contributions.
Merge branch 'master' of github.com:FuegoFro/DeskDefender
Preprocess images by grouping by cells and combining cells to get blocks.
Merge branch 'master' of github.com:FuegoFro/DeskDefender