Added option to use native GIT executable instead of JGit implementation, for speed.
Merge remote-tracking branch 'github/master'
Podbicie wersji, dla zgodności z Maven < 3.1.*
Remove useless header
Zmiana wersji dla COI
Merge remote-tracking branch 'github/master'
Merge branch 'master' of github.com:wavesoftware/maven-git-commit-id-plugin
README update