dataset info for [this PR](https://github.com/tensorflow/datasets/pull/239)

mpii_human_pose.json

{
  "citation": "@inproceedings{andriluka14cvpr,\n        author = {Mykhaylo Andriluka and Leonid Pishchulin and Peter Gehler and Schiele, Bernt}\n        title = {2D Human Pose Estimation: New Benchmark and State of the Art Analysis},\n        booktitle = {IEEE Conference on Computer Vision and Pattern Recognition (CVPR)},\n        year = {2014},\n        month = {June}\n}", 
  "description": "Human-annotated 2D human poses on in-the-wild images", 
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