[jboss-as7-dev] How to fast-forward a pull request in github?

Hi all, When applying a pull request in Github (using the Big Green Button that says 'Merge Pull Request') this always creates a merge commit which is something that we generally don't like (I think ;) How people generally apply pull requests with a fast-forward for a cleaner commit history? Is there some handy command that people use for this? Cheers, David