Released version 0.2 to PyPI

• CPU Version: https://pypi.org/project/yolo34py/0.2/
• GPU Version: https://pypi.org/project/yolo34py-gpu/0.2/

Breaking Changes

1. The category labels returned by the pydarknet.Detector.detect() method are now strings. Refer this commit for details.
2. pydarknet.is_compiled_with_gpu and pydarknet.is_compiled_with_opencv are now methods. Refer this edit for details.

Other Changes

1. Improved docstrings.
2. Various code clean-ups.