Remove private copy of six package and rather use external version

[eduardo-rodrigues]

As per our discussion @henryiii.

[henryiii]

You'll need to remove 'numpythia.extern', from the setup.py main function, too. This is one of the reasons listing them there manually is a bad idea...

[eduardo-rodrigues]

Yep, noticed it and remove it - had indeed overlooked, not seeing it when grep'ing for 'six' somehow.

[coveralls]

Pull Request Test Coverage Report for Build 8

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 0.0%

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Totals
Change from base Build 4:	0.0%
Covered Lines:	0
Relevant Lines:	22

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 33

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+35.2%) to 100.0%

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Totals
Change from base Build 23:	35.2%
Covered Lines:	22
Relevant Lines:	22

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💛 - Coveralls

[eduardo-rodrigues]

Hi @henryiii, the issue is that same as the one we talked about yesterday. It's got to do with a mix-up when unittest tries to run. Will you have time to make the move to pytest as you suggested?

[henryiii]

Yes, later today. Would you like me to work on this branch or a new one and then you can merge this one?

[eduardo-rodrigues]

Brilliant! As you prefer … We can even change the PR title to incorporate both things.

[henryiii]

Okay, I'll work here then.

[eduardo-rodrigues]

Thanks a lot @henryiii!