Clean up auras from their source's auras when destroyed
Clean up auras from their source's auras when destroyed

Fixes #37

liujimj/fireplace,jleclanche/fireplace,Meerkov/fireplace,smallnamespace/fireplace,Ragowit/fireplace,butozerca/fireplace,oftc-ftw/fireplace,Meerkov/fireplace,beheh/fireplace,amw2104/fireplace,smallnamespace/fireplace,liujimj/fireplace,oftc-ftw/fireplace,Ragowit/fireplace,butozerca/fireplace,NightKev/fireplace,amw2104/fireplace