[#1161] Added build system scripts

tools/build-system/README

tools/build-system/automatic-build-machine.sh

tools/build-system/bin/git-dch

tools/build-system/gpg/setup-gpg.sh

tools/build-system/launch-build-machine.sh

tools/build-system/packages/git-buildpackage_0.4.45_all.deb

tools/build-system/remote/build-package-ubuntu.sh

tools/build-system/remote/update-repository.sh

tools/build-system/send-emails.sh