Merge branch 'maint'

* maint:
git-remote: exit with non-zero status after detecting errors.
rebase -i: squash should retain the authorship of the _first_ commit
git-add--interactive: Improve behavior on bogus input
git-add--interactive: Allow Ctrl-D to exit

diff --cc Documentation/git-rebase.txt
Simple merge

diff --cc git-rebase--interactive.sh
Simple merge

diff --cc git-remote.perl
Simple merge

diff --cc t/t3404-rebase-interactive.sh
Simple merge