Miscellaneous fixes relating to command permissions.
Removal of dead code and imports.
Console and player message polishing.
More general code cleanup.
Vault >= 1.2.8 is now required to run SlotGroups.
This has not been extensively tested yet with different permissions systems, and should be regarded as beta-quality for now. It is confirmed to work with PEX and PermissionsBukkit through Vault.
If upgrading from version of SlotGroups previous to 0.2.5, please note that the configuration format has changed slightly. It will generate a config.yml when run the first time and won't touch your old SlotGroups.yml so you can reference it if needed.
