Move pep8 dependency into pep8 tox test

The other unit tests do not require pep8

Change-Id: I7ac68bb3ff48a76a6dd3db08a05827831069f141
Merge "Move pep8 dependency into pep8 tox test"
Update readme with links to bug tracker and source

This update is based on the oslo-cookiecutter template for the
README for a new library.

Change-Id: I3ee1e22377e1dcca86ca3d5b208abc3c9dea70a9