mkdir and rmdir are now in this module and not in the rockbox API
implements the 'dir' iterator to browse directories
Based on LuaFileSystem : http://www.keplerproject.org/luafilesystem
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@26913 a1c6a512-1295-4272-9138-f99709370657
