No.
The git blog says using this button you always get an –no-ff merge (no fast-forward merge).
You’d have to do a manual merge if you don’t want merge bubbles:
git checkout master
git remote add cameronmcefee git://github.com/cameronmcefee/Spoon-Knife.git
git fetch cameronmcefee
git merge cameronmcefee/my-branch
git push origin master