Add --symbolic flag to git-rev-parse.
Add --symbolic flag to git-rev-parse.

This is most useful with --all, --revs-only, --no-flags and --verify.

Signed-off-by: Junio C Hamano <dc50d1021234060e53ec42a77d526afa2fe07479@cox.net>

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