One way to merge in these changes is to pull them into a local branch for review, verifying the changes and then merge to back to master.

# Check out a new branch for integration
git checkout -b integration

# Fetch the merge request into this branch
git pull \
  git://gitorious.digitalstrom.org/dss/dss-mainline.git \
  refs/merge-requests/156

# Show the commits, assess they are okay
git log --pretty=oneline --abbrev-commit master..integration

# To apply the changes to your master branch:
git checkout master
git merge integration
git push origin master