Merge branch 'jc/blame' (early part) into HEAD

* 'jc/blame' (early part):
  git-blame --reverse
  builtin-blame.c: allow more than 16 parents
  builtin-blame.c: move prepare_final() into a separate function.
  rev-list --children
  revision traversal: --children option

Conflicts:

	Documentation/rev-list-options.txt
	revision.c

revision.h

@@ -104,6 +104,7 @@ struct rev_info {
 	struct diff_options pruning;
 
 	struct reflog_walk_info *reflog_info;
+	struct decoration children;
 };
 
 #define REV_TREE_SAME		0