Update hierarchical partial pooling notebook (#219)

* update notebook to use dims and coords
* watermark
* rerun with v3 and theano
* Update references.bib

Author: mjhajharia

examples/case_studies/hierarchical_partial_pooling.ipynb

@@ -162,11 +162,28 @@ @misc{szegedy2014going
   eprint={1409.4842},
   archivePrefix={arXiv},
   primaryClass={cs.CV}
+  }
+  
+@misc{carpenter2016hierarchical,
+  title={Hierarchical partial pooling for repeated binary trials},
+  author={Carpenter, Bob and Gabry, J and Goodrich, B},
+  year={2016},
+  publisher={Technical report. Retrieved from https://mc-stan. org/users/docum entat ion~…}
 }
 
 @book{gelman2013bayesian, 
   title={Bayesian Data Analysis},
   publisher={Chapman and Hall/CRC}, 
   author={Gelman, Andrew and Carlin, John B. and Stern, Hal S. and Dunson, David B. and Vehtari, Aki and Rubin, Donald B.},
   year={2013}
-}
+}
+@article{efron1975data,
+  title={Data analysis using Stein's estimator and its generalizations},
+  author={Efron, Bradley and Morris, Carl},
+  journal={Journal of the American Statistical Association},
+  volume={70},
+  number={350},
+  pages={311--319},
+  year={1975},
+  publisher={Taylor \& Francis}
+}