git-blame.el: show the when, who and what in the minibuffer.
git-blame.el: show the when, who and what in the minibuffer.

Change the default operation to show 'when (day the commit was made),
who (who made the commit), what (what the commit log was)' in the
minibuffer instead of SHA1 and title of the commit log.

Since the user may prefer other displaying options, it is made as a
user-configurable option.

Signed-off-by: Junio C Hamano <a6723cc3f76163bf7adb636a73ac3b0ceb3e6b9b@pobox.com>

destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git,destenson/git