Explicitly disallow python 2.x
Merge pull request #44 from jmwaura/disallow_python2

Explicitly disallow python 2.x
Revert "Replace all explicit unicode/utf8 conversion with no-ops for python3."

This reverts commit 3f0f84a505540dbe58496e6edded968ed9089823.
Merge remote-tracking branch 'upstream/master'