Gardening

[romcheg]

• Move all dependencies to one place
• Separate test and production dependencies
• Use pbr to automate package building
• Move meta information to setup.cfg
• Clean up tox.ini
• Add flake8 checks and add them to the default tox configuration

[romcheg]

@cyberdelia this pull request does not bring any new features but should make the life easier both for you and developers.

[romcheg]

The CI succeeded but did not report that to Github. Perhaps re-triggering the build will help