Python3 compatibility updates (#28)

* WIP: fix imports and exception calls for python3

* fix remaining utf-8 encoding issues

* fix init trying to return a value

* change expected control checks to bytes

* make comparison of request params non-ordered

python3's url request handler likes to reorder the parameters its given
this breaks the params out and checks each separately

* refactor to simplify params comparisons

* FIX: decode auth bytes back to a utf-8 string

* FIX: also decode response data bytes to utf-8

* FIX: do not decode response data if already a str

* enhance existing test to ensure auth is str no bytes

* change test req and import from mox to mox3

* add additional python versions to CI config

* fix failing 3.7 travis ci build

* Apply changes to duo_openvpn.py similar to what we do in duo_client_python

* Apply changes to https_wrapper similar to what we do in duo_client_python

* Fixup the import bugs

* Use six for StringIO import

* Include six for py2->py3 compat layer

* use explicit decoding on control file data

* Consistent encoding and updated variable names for clarity

* Revert variable names back again.

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