Treelite 0.32

Usability improvements

• Add __version__ attribute (#17)
• Shape results appropriately for multiclass classification (#16)
• Add default LOG handler, to make C API easier to use (#19)
• Allow batches smaller than nthread

Bug fixes

• Python 2.7 compatibility fix (#14)
• handle categorical splits with empty left_categories
• Fix create_shared() to be compatible with shells zsh and fish (#18)

New feature

• (Experimental) Export model as XGBoost model file, as per request in #14.