[WIP] Ported library to Python 3

[tricoder42]

⚠️ Work in progress, do not merge 💣

Compatability issues with Python 2/3:

• random.choice doesn't respect random.seed. random.random produces the same numbers for given seed for both Python 2 and 3, but random.choice doesn't select the same elements from list. Following snippet produces different output in Python 2 and 3:

    import random
    random.seed(10)
    print([random.choice(['C', 'D']) for i in range(20)])

Some strategies relies on random choices. Right now the tests fail for QLearner

[drvinceknight]

Given @marcharper's work on #264 can we close this PR?

[tricoder42]

Yep :)