Fix how to handle env vars on examples

[jsanz]

When running examples you are forced to set up environment variables so the arguments parsing is not meaningful. Review the way I'm proposing to handle this (there are other ways) and if you agree, please apply the same workflow to the rest of the examples so they can be run passing the credentials as parameters.

[oriolbx]

Going to apply the same workflow to the rest of examples

[jsanz]

@alrocar, before merging this fix to the examples... do you think there's anything we need to do? like tagging or deploying this to pip later, etc

[alrocar]

Merge and I'll take care. Next time I'll write a document with the steps for publishing a new version:

• Update NEWS file with the changes
• Update version 1.1.1 to 1.1.2 everywhere (specially in setup.py and the doc folder)
• Merge/tag/publish to pip

Thanks!

[jsanz]

@alrocar added those changes, please review 😄

[alrocar]

🇪🇸

[jsanz]

added a line to the NEWS and merged, all yours @alrocar for update on pip