Merge branch 'hotfix/travis-ci' into develop
Merge branch 'hotfix/travis-ci' into develop
Merge branch 'hotfix/travis-ci' into develop
No need to keep the documentation folder

Doxygen recreates it automatically.
Merge branch 'hotfix/appledoc' into develop
Answer null for nil using ASNullForNil(object)
Test null-for-nil behaviour
Merge branch 'feature/null-for-nil' into develop
Version bump, v1.6 (163.41)
Merge branch 'release/1.6'
Merge branch 'develop'