pyflakes: remove unused imports
pyflakes: remove unused assignment
pep8: add missing newlines to files
shared_containers: import liteauth and swob as modules

This shortens the import lines and makes it easier to see exactly
where each symbol originates in the rest of the code.
pep8: fix E265 block comment should start with '# ' errors
pep8 E713: test for membership should be 'not in'
pep8: fix long lines
pep8: fix indentation
pep8: avoid multiple imports on a single line
pep8: add two spaces infront of inline comment
pep8: remove trailing newline
tox: add pep8 and pyflakes checks
Merge pull request #27 from mgeisler/flake8-cleanups

Flake8 cleanups and add tox config