Register permission nodes for vanilla Minecraft commands with vanilla.command.* instead of obfuscated class name. Fixes #191.
Only register vanilla commands without Bukkit replacements

Most vanilla Minecraft server commands are reimplemented by Bukkit.
Remove the registrations for these vanilla commands since they are
not used anyways. /debug from vanilla remains since it has no Bukkit
equivalent (/publish too, though its not used on dedicated servers).