Merge branch 'hotfix/0.1.1' into develop
docs(contributing): make the contributing guidelines less strict
fix(travis): add a workaround for outdated xctool on travis

For details about the error that occurs, please see: https://github.com/travis-ci/travis-ci/issues/2836
feat(presentation): add view controller presentation

Introduce a presentation method that also gets a view controller passed in, where the error should be presented on. This can be used for easily implementing frameworks like TSMessages.
Merge pull request #2 from Hotel-Reservation-Service/feature/viewControllerBasedErrorPresentation

feat(presentation): add view controller presentation
chore(version): bump version to 0.2.0
Merge branch 'release/0.2.0'