Version 4.1.0 - Support for Keypoints, Boundaries, Occlusion, Superparts

Post-CVPR update to the Detail API for the PASCAL in Detail Challenge.

Changes:

• Added getKpts(), getBounds(), getOccl()
• Added superpart param to getMask()

Intended for use with the trainval_withkeypoints.json dataset.

See PythonAPI/ipynb/detailDemo.ipynb for the updated demo.