simple sorting capabilities + updated some rights

- Added simple sorting capabilities to add_grants.sh (and some pointers for new users): The order in which entities show up in structr-ui is now dependent on the order in this file.

- changed the rights for _registration, _login and _logout to 64, 64, 4 (respectively)
Merge pull request #40 from vigorouscoding/patch-1

simple sorting capabilities + updated some rights