Fix IDPH-vaccine-to-S3 ETL to handle null values (#274)

IDPH vaccine ETL debug logs

 Update vac tracker to new dataset URL (#273)

Fix cityofchicago ETL (#269)

ETL for city of chicago dataset (#265)

Updated google_mobility.ipynb (#268)

google public data of covid19_google_mobility was moved to covid19_google_mobility_eu

Update country_codes_utils.py (#266)

* Update country_codes_utils.py

added "Korea, North" mapping to the COUNTRY_NAME_MAPPING

* Update country_codes_utils.py

change the order of items in COUNTRY_NAME_MAPPING dict object

* Update country_codes_utils.py

update exception for sampling (#263)

Update pymc3_generative_model.py (#262)

* Update pymc3_generative_model.py

add `init="adapt_diag"` to `pm.sample` to avoid the `Mass matrix contains zeros on the diagonal` error.

`jitter+adapt_diag` made initialization much more sensitive on the master branch, causing ValueError: Mass matrix contains zeros on the diagonal to appear more frequently.

* add multiple init settings

Fix/idph etl logs (#261)

* Add logs to idph Hospital Util

* Add gender mapping in idph vaccine