Add six library usage for cross-version compatibility; Resolve issue #117#161

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duboviy:master

Nov 5, 2016

Commits on Nov 5, 2016

Add usage of six library (https://pythonhosted.org/six/#six.with_metaclass) for cross-version compatibility. Add cross-version map handling (in Py 3.x map returns genarator instead of list)
duboviy
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