Merge branch 'maint-1.5.4' into maint

* maint-1.5.4: svn-git: Use binmode for reading/writing binary rev maps diff options documentation: refer to --diff-filter in --name-status git-svn bug with blank commits and author file archive.c: format_subst - fixed bogus argument to memchr copy.c: copy_fd - correctly report write errors gitattributes: Fix subdirectory attributes specified from root directory