WormNestCaves occasionally generates sandstone around the cave
Only when the block around the cave is sand.
Merge pull request #1664 from mc-server/SandstoneCaves

WormNestCaves occasionally generates sandstone around the cave
"Don't set compiler to gcc on clang builds"
Fix forgoten thens
Double equals
final syntax errors
Clang needs the libstdc++ that comes with gcc-4.8