[15471] Set environment variable git.target.branch for travis-ci
[15471] Set environment variable git.target.branch for travis-ci

DavidGutknecht/elexis-3-base,DavidGutknecht/elexis-3-base,DavidGutknecht/elexis-3-base,DavidGutknecht/elexis-3-base,DavidGutknecht/elexis-3-base