fix python 3 support

[Roguelazer]

Adds compatibility with pip7 and moves futures into the python 2.x requirements file (since it's built-in on python 3.2 and above and the one in pip doesn't work at all under py3.4/py3.5)

[Roguelazer]

Now also fixes a str vs bytes issue in the halist command.

[Roguelazer]

This one, too, @sloppyfocus

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