Use pbr instead of Bumpversion

[veit]

pbr has a much larger functionality than Bumpversion. So it can not only update versions. It updates version numbers based on git revisions and tags. In addition, it offers the following features:

• AUTHORS: Generate AUTHORS file from git log
• ChangeLog: Generate ChangeLog from git log
• Manifest: Generate a sensible manifest from git files and some standard files
• Requirements: Store your dependencies in a pip requirements file
• long_description: Use your README file as a long_description
• Smart find_packages: Smartly find packages under your root package
• Sphinx Autodoc: Generate autodoc stub files for your whole module

[veit]

Maybe the solution outlined in the issue Consider dropping PBR is the better idea.