Evaluate new GitHub checks feature

[grosspersky]

User Story

As a:

developer

I want:

to see build and linting errors directly in GitHub

so that:

I can see faster why my newly written code is failing

Acceptance criteria:

• [ ] Checks are available in pull requests

Additional info:

GitHub now allows the direct display of errors that happen during CI builds with specific code highlighting. More information can be found here: https://help.github.com/articles/about-status-checks/#checks

It should be investigated if this can be easily activated for geli or which steps would be necessary to activate it.

[PatrickSkowronek]

@grosspersky I'm already on this. Since this update coveralls can't send the status proper and need to be installed over the marketplace https://github.com/marketplace/coveralls.