Add String.contains for browsers that don't support it (which is everything other than Firefox)
Fix a crash in the freeze chest trap
Fix spellcaster AI crashing on certain spells
Add three more slime monsters

Also:
- Emerald slime doesn't spawn from chest traps on floors where no slimes spawn normally
- Absorb energy ability is now adjusted for your level
- Shock spell does not crash in cases where dx and dy are 0
- rust slime renamed to ochre slime
- unicorn jelly occurrence lowered and stats raised
Add floor traps!
Housekeeping, small tweaks
- Fix for potential issue of key generating on boulder
- Lower occurrence of pulsating torc
Add items that modify your max health and energy
Fix an issue with some yes/no popups not properly responding to a yes