Enforce 100% branch coverage

[jayvdb]

With a bunch of exceptions due to old code, we can lock down this repo to comply with the @coala rule of 100% branch coverage, to prevent new accidental additions of code without proper coverage. It is often hard to spot where tests have not provided 100% coverage. We have tools for that. And we have a setup.cfg template for it.

Issues have been created for most of the outstanding test coverage issues, and they will likely be great GCI tasks.

• https://github.com/coala/coala-quickstart/issues/275
• https://github.com/coala/coala-quickstart/issues/276
• https://github.com/coala/coala-quickstart/issues/277
• https://github.com/coala/coala-quickstart/issues/278
• https://github.com/coala/coala-quickstart/issues/279
• https://github.com/coala/coala-quickstart/issues/280
• https://github.com/coala/coala-quickstart/issues/281
• https://github.com/coala/coala-quickstart/issues/274
• https://github.com/coala/coala-quickstart/issues/273
• https://github.com/coala/coala-quickstart/issues/222

[gitmate-bot]

GitMate.io thinks the contributor most likely able to help you is @satwikkansal.