Completed 2to3 conversion without running tests

[cacods]

Applied 2to3 to convert from Python 2 to Python 3. Python 3 version used: 3.5.2.

[bbangert]

I guess this presents the question of whether the goal is to still support Python 2. If that was the goal then six should probably be used to handle both versions since changing the unicode to str will definitely break existing users still on Python 2. I'm fine moving to Python 3 only support and dropping Python 2 if we move that to a new branch and version to reflect it just so that Python 2 users do not inadvertently get broken.

[cacods]

As Python 2 was gone last year, I think is a good idea to have a separate version and branch for Python 3.

[bbangert]

@cacods agreed.