controllers: Fixed pep8 errors
middleware: Fixed pep8 errors
config: Fixed pep8 errors
tests: Fixed pep8 errors
model: Fixed pep8 errors
tracking: Fixed pep8 errors
lib: Fixed pep8 errors
tests: Added pep8 unit test
Fixed "filter(... is None)" usage

PEP8 complains about "== None" but "... is None" is not working.
Wrapping "... is None" in an and_ function however works.
Added pep8 as testing requirement
Merge branch 'master' into pep8

Conflicts:
	test-requirements.txt
Merge pull request #7 from Turbo87/pep8

PEP8 error fixing and unit testing