Bukkit

- Added /guiopener aliases to see all aliases [Permission: guiopener.aliases] - Added argument aliases (/guiopener w instead of /guiopener workbench) - Added message when only typing /guiopener player - Next update should be for version 1.8

Please write other suggestions in the comments.

- when typing /guiopener player <not an player that exists or is online> there is an error output in console
- luckily no other bugs