github plugin needs work

[aspiers]

TODO list imported from the now-merged PR #28:

• each comment on an issue or PR results in the same line in the report
• if you create a PR, it's probably not worth mentioning that you commented on it
• work on related repos (origin and fork) need to be grouped together
• all work on a pull request needs to be grouped together
• rebasing or fast-forwarding a personal fork branch and pushing it generates uninteresting events
• repeated git push -f cause a lot of duplicate info
• ensure items within a single list are always chronologically sorted
• add repo inclusion / exclusion lists

[saschpe]

feel free :-)