Add some merge review utilities #15

Maybe a tad out of scope at the moment, but it would be nice to have some small utils to actually review merge requests.

For example, one thing that I usually do when reviewing is git reset HEAD^ or using the commit hash of the first commit in the MR when there are several commits (and I have to do a git log and it's sometimes annoying). That way I can see all the changes inline in my IDE for instance, which is better IMO than looking at diffs and truncated files on Gitlab.

Something to think about. The other enhancements proposed until now should have priority I think.