Fixes:

• Don't sleep if the chunk doesn't appear to be generated when scanning a region. (Don't think chunk generation was ever async before.) This will especially help with servers that use custom world generators/pregenerated custom world with pockets of "void" chunks.

Features:

• Metrics to see if (lots of) servers actually use this

Also did some code cleanup, namely removing the mixture of spaces and tabs.

Also added a metrics thingy to the description to make the bukkitdev approver happy. If you're bored you can go read it, took me four minutes to think about and type out xddd