Merge branch 'maint'

* maint:
  Start preparing for 1.5.1.3
  Sanitize @to recipients.
  git-svn: Ignore usernames in URLs in find_by_url
  Document --dry-run and envelope-sender for git-send-email.
  Allow users to optionally specify their envelope sender.
  Ensure clean addresses are always used with Net::SMTP
  Validate @recipients before using it for sendmail and Net::SMTP.
  Perform correct quoting of recipient names.
  Change the scope of the $cc variable as it is not needed outside of send_message.
  Debugging cleanup improvements
  Prefix Dry- to the message status to denote dry-runs.
  Document --dry-run parameter to send-email.
  git-svn: Don't rely on $_ after making a function call
  Fix handle leak in write_tree
  Actually handle some-low memory conditions

Conflicts:

	RelNotes
	git-send-email.perl

builtin-write-tree.c

@@ -36,8 +36,10 @@ int write_tree(unsigned char *sha1, int missing_ok, const char *prefix)
 			die("git-write-tree: error building trees");
 		if (0 <= newfd) {
 			if (!write_cache(newfd, active_cache, active_nr)
-					&& !close(newfd))
+					&& !close(newfd)) {
 				commit_lock_file(lock_file);
+				newfd = -1;
+			}
 		}
 		/* Not being able to write is fine -- we are only interested
 		 * in updating the cache-tree part, and if the next caller
@@ -55,6 +57,8 @@ int write_tree(unsigned char *sha1, int missing_ok, const char *prefix)
 	else
 		hashcpy(sha1, active_cache_tree->sha1);
 
+	if (0 <= newfd)
+		close(newfd);
 	rollback_lock_file(lock_file);
 
 	return 0;