setup.py should use requirements.txt and other req cleanups.

[raubitsj]

important fix here is that requirements were different, we were not specifying protobuf version dependency.

[coveralls]

Pull Request Test Coverage Report for Build b07a1261-0208-409f-9383-7ad146d76925

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.4%) to 63.921%

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Totals
Change from base Build 2ab103ae-39b4-406a-9897-dab4eef3c609:	0.4%
Covered Lines:	11167
Relevant Lines:	17470

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💛 - Coveralls