Add Python 3 compatibility (updated)

[asavoy]

This pull request builds from the work by goanpeca in #13.

In addition to the Python 3 compatibility and PEP8 code style fixes in the original branch, these have also been done:

• Rebased the branch on top of latest master, resolved conflicts
• Inspected code to ensure latest master changes are present
• Spot-fixed a case of Python 3 incompatibility
• Ran test/test_everything.py successfully on Python 2 and Python 3
• Ran in a Python 3 virtualenv with a live GA account and confirmed that data sent appears in GA
• Reverted one change to handling VERSION in setup.py, so that it behaves as it does in master

What hasn't been done:

• I haven't done any deep review of the Python 3 changes. There are some issues that would warrant a closer look, but don't seem to cause any problems in testing:

  • Some instances of str still remain when they probably should be six.text_type
  • Some commented out code

• I haven't done any manual testing in Python 2 to confirm it works with a live GA account.

I think this is at least at a working point that is worth checking in for a maintainer's feedback, if at least to gauge interest in getting this merged in.

[BoboTiG]

Any news from the owner?

[olymk2]

can this be merged / can another dev take ownership if it no longer maintained ?