1.4.11b Hotfix

Water and Lava Mobs will now correctly check for surrounding solid
blocks when spawning.

Added a second check to mobs that spawn around block such as Fire, Lava
or Portals. This should work as a fallback for mob spawning mobs.

Dwellers should spawn now, only in swamps though.

Concapede Segments will now check for at least one nearby Concapede Head
if naturally spawning. They shouldn't naturally spawn at all though,
this is just a fallback for weird configs and mob spawning mods.