Update ClassTransformer.java

Added code to stop HostileWorlds from spawning the boss pyramid.
Update ClassTransformer.java

Changed code to add a return instruction to the start of the method, rather than deleting instructions.
Merge pull request #1 from Blargerist/patch-1

Stop the HostileWorlds mod from spawning the boss pyramid
 * The boss can spawn inside of solid blocks when the pyramid is generated and suffocate
Fix portals being broken by fluids

Fixed portals being broken by fluids by making the portal material solid
to fluids