Pass --no-edit when used with git 1.7.8 and newer.

Pass --no-edit when used with git 1.7.8 and newer.

Not sure if this is needed to avoid it trying to run an editor. Probably
there is never a controlling terminal and probably git notices and does
nothing. But I'm just copying what I have in git-annex assistant here.

(Although with a much worse git version comparion, that only really works due
to luck.)