Allow SSL for python client import; add MacOS tips

Allowing SSL required  adding the certifi import to the requirements and .py, as well as adding a commented out snippet and verbiage in the readme.

MacOS needed an interim client lib, cython, as well as a tip about using python3 & pip3 now that python is shipped

Author: jamiesmith

Exploring Public Datasets/nyc_restaurants/scripts/README.md

@@ -68,5 +68,6 @@ curl -H "Content-Type: application/json" -XGET localhost:9200/nyc_restaurants/_c
 ```
 
 NOTE:
+
 If you are using https you will likely need to also use the
-`--user username:password` with your curl command
+`--user username:password` option with your curl command