Travis tested, deb addChangelogEntry works

getBranch uses travis envvar
getBranch uses git if no travis
getBuildId uses travis envvar
git getBranch gives the last tag of branch name
travis module not works if envvar Travis is not yes
travis getBranch returns value of TRAVIS BRANCH envvar
travis getCommit returns value of TRAVIS COMMIT envvar
travis getBuildId returns value of TRAVIS BUILD NUMBER envvar