Fix us census

[cgomez9]

Description

A rework was made of the US Census module. Previously a zip file was downloaded and processed, now we get the dataset directly from an API in JSON format. Also a new common file was included with FIPS codes of all states and counties of USA.

Fixes #37

Checklist:

• [x] I have read the CONTRIBUTING GUIDE and made sure this Pull Request is compliant with it.
• [x] I have read the DATA MODEL and DATA SOURCES and made sure this Pull Request is compliant with it.
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] New and existing unit tests pass locally with my changes
• [ ] Any dependent changes have been merged and published in downstream modules

[cgomez9]

I created the test to check the dataset format but it was failing and its a problem with columns "county" and "state" that are not taking into consideration. I believe the dataset has a correct format, I tried to improve the tester but I don't want to break something. What should I do? @ManuelAlvarezC

[ManuelAlvarezC]

Hi @cgomez9, and thanks for your submission.

The issue you mention is caused because you are not following the Data Model. Basically, state column should be renamed to region and county to sub_region.

Please fix it, and I'll review the rest of the submission

[ManuelAlvarezC]

Also, when you fix all this, find a way to delete from the git history the fixture and long notebook you included, as git includes the history it will make the repository unnecesary large and slow.

[cgomez9]

I made all the requested changes, waiting for #62 to resolve.