Fixed: Usage for /tpaccept and /tpdeny
Fixed: No arguments means accept/deny latest

This will accept or deny the latest teleport request in /tpaccept and /tpdeny if no arguments are given. It will display usage if there are no pending requests.

This commit also renames all the classes to their full names instead of abbreviations.
Updated: Use new ban API

This has NOT been tested. Bukkit released a new ban API, and this should be backwards-compatible, as well.

This also has lots of little formatting/style changes.