It's sort of like the per branch source code only for commits. Currently, I can only view my commits to the master branch.
I am currently missing this feature too.
It's been 21 days, I don't think it's much of a feature.
It would be nice to have, because I'm required to work on a branch instead of forking and it would be useful to see my recent commits. It's not a huge deal though as I've got another github app that can do this.
Add support for browsing commits on any tag or branch
A ref selector is shown at the bottom of the commits list
in the same style as the code tab.
This has been added in master and will be included in the next release.
Thanks @kevinsawicki !