Updated for 1.8
Added initial nether support
* Added netherrack generators (cobble gen in nether)
* Added "Hot Water Bucket" which can place water in nether
Made it possible to have multiple dimensions per skyblock world
More nether implementation
* Added a portal travel agent that makes sure portals are island specific
* Allow environment specific templates
Added ability for blaze, wither skeletons, and skeletons to spawn on nether brick in the nether
* Without this, they cannot be obtained as there are no fortresses