Merge pull request #431 from jGaboardi/k_nearest_demo_notebook

K-nearest p-median demo notebook

Author: ljwolf

docs/tutorials.rst

@@ -25,6 +25,7 @@ Tutorials
     notebooks/mclp_gis.ipynb
     notebooks/p-center.ipynb
     notebooks/p-median.ipynb
+    notebooks/p-median_variations.ipynb
     notebooks/p-dispersion.ipynb
     notebooks/facloc-real-world.ipynb
     notebooks/facloc-lscpb-real-world.ipynb