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master: 100%

Pull #895

travis-ci

Add rubocop

I fixes the low hanging fruits without breaking the specs (at least
locally).

Rules that could not be fixed that easy were added as exception to the
`.rubocop.yml` configuration file.

Some of those exceptions might be fixable with some code recatoring,
which might be a good point to start with future PRs.

723 of 723 new or added lines in 27 files covered. (100.0%)

19020 of 19026 relevant lines covered (99.97%)

194.26 hits per line