Follow symlinks when setting file permissions.

Squashed commit of the following:

commit b76f854da84753db7e5a855d6aa89f2a958cc69f
Author: Thorsten Eckel <te@znuny.com>
Date:   Tue Mar 25 09:46:25 2014 +0100

    Updated usage info.

commit 2e15beb31cf4ddea07f39cc4343465f0153cc482
Author: Thorsten Eckel <te@znuny.com>
Date:   Tue Mar 25 09:44:17 2014 +0100

    Added parameter to follow symlinks.