Python 3 support#4

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rwesterlund wants to merge 3 commits intoscottrice:masterfrom

rwesterlund:python3

Commits on Feb 18, 2015

Initial work on Python 3 compatibility.
rwesterlund
committed

Commits on Feb 25, 2015

Restored _is_user_directory usage.
rwesterlund
committed

Commits on Jul 25, 2015

Python 2.7 compatibility fix for the CRC code.
rwesterlund
committed