"Safe" Regeneration Fix; The last update kinda broke safe regeneration, so players wouldn't get pushed upwards if they were ever stuck inside blocks. This is now completely FIXED (so players will always get pushed upwards, out the way of regenerating blocks, never getting stuck), and optimized to take up as little of bukkit's main thread as possible.

Next planned update (v1.5):

ActionBar messages on regeneration + BlockData fix (Stairs and other direction-orientated blocks not regenerating properly)