apply-pr: merge --ff-only instead of cherry-picking if possible
TeamAddEvent format changed again
Gist.iter_forks already does the right thing
get_repo refactor for code-deduplication

There is now one, and only one place that tries to find out which repo
you want to act on. Should make it easier to allow more commands to work
on repos specified on the command line.
Use check() insteadof duplicating exitcode checks
pull-request: don't default to 'master' but to parent.default_branch
Make 'browse' more versatile.
Show usernames for organization logs
Bump version number
Merge tag '1.25' into debian
Update debian package