Manual tagging

VERSION_CURRENT=1.1.0
VERSION_NEXT=1.2.0
git checkout wip
git tag v${VERSION_CURRENT}
git checkout milestones
git merge --no-ff v${VERSION_CURRENT}
# build
git push origin milestones
git checkout wip
# change version number
git commit -avm "init version ${VERSION_NEXT}"
git ush origin wip

In the specific case of ScalaIDE I use the following information to manage the 1.x.y versions.

wip => wip_exp_backport
build =
  cd org.scala-ide.build
  ./build-ide-local-2.8.1.final.sh
change version number =
  cd org.scala-ide.build
  ./set_version.sh ${VERSION_NEXT}-SNAPSHOT
  grep -r ${VERSION_CURRENT} ../**/pom.xml
  grep -r ${VERSION_CURRENT} ../**/MANIFEST.MF
  # build and fix any issue related to version modification