Python3 Support

[smellman]

Fixes for supports Python3.

• includes fixes from Python3 compatibility #71
• docker container uses pip3
• fixes with scope in test code for Python3
• fixes decode issue

[claassistantio]

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[smellman]

@jaygorrell Can you review my PR?

[jaygorrell]

Looks good, thanks!

[chrisgilmerproj]

@jaygorrell - should we tag this as v2.0.0 and start doing releases? It might actually help us in the future to have these tags for folks doing development.

[jaygorrell]

I think so, yeah - feel free to push that if you have a moment.

[chrisgilmerproj]

Done!

[chrisgilmerproj]

I tested this against #100 and was able to prove everything worked with make scan and make update. Nice job @smellman!