Java 7-ize this class

Update potions to 1.9

Formatting

Fix null teleport costs.

Throw meaningful warnings when wrong Essentials version is used with …

…unsupported mod packs.

Update ItemStack reference to getTypeId()

CB 2788 - 1.5.2

CB 1.4.7

CB 2543 - 1.4.5

CB 1.3.2 R1