Merge pull request #11949 from PsiOmegaDelta/160109-AI

Creates a new process for handling AI code.

code/datums/ai/ai.dm

@@ -0,0 +1,5 @@
+/datum/ai
+	var/name
+
+/datum/ai/proc/process()
+	return PROCESS_KILL

code/datums/expansions/expansion.dm

@@ -1,7 +1,7 @@
 /datum/expansion
 	var/datum/holder = null // The holder
 
-/datum/expansion/New(var/atom/holder)
+/datum/expansion/New(var/datum/holder)
 	if(!istype(holder))
 		CRASH("Invalid holder.")
 	src.holder = holder