Py2 compatability has been broke elsewhere drop it

This is all noop in Py3, and Py2 is broke now in various places.
Dropping Py2 code as it will not be a thing going forward.

Django 2 is the next release, Py2 support will be dropped, as such,
dropping this is forward looking.

Flake8 Fixes

Mostly whitespace fixes
Some unicode fixes
Fixed up CSV writer. str is not bytes and all.

python3 compatibility

- Things are suggested in python3 porting guide.
https://docs.djangoproject.com/en/1.8/topics/python3/

1. adding ```from django.utils.encoding import
python_2_unicode_compatible```

2. ``` __str__``` instead of ```__unicode__```
https://docs.djangoproject.com/en/1.8/topics/python3/#str-and-unicode-methods

3. Adding ```from __future__ import unicode_literals``` at the top
of your Python modules
https://docs.djangoproject.com/en/1.8/topics/python3/#unicode-literals

4. Removing the `u` prefix before unicode strings;
https://docs.djangoproject.com/en/1.8/topics/python3/#unicode-literals

- also closed #66

Signed-off-by: Hiroshi Miura <miurahr@linux.com>