Added server IP to get_server_info(12) which gives the current server IP

	modified:   src/main/java/com/laytonsmith/abstraction/MCServer.java
	modified:   src/main/java/com/laytonsmith/abstraction/bukkit/BukkitMCServer.java
	modified:   src/main/java/com/laytonsmith/core/functions/Minecraft.java

src/main/java/com/laytonsmith/core/functions/Minecraft.java

@@ -836,7 +836,7 @@ public Construct exec(Target t, Environment env, Construct... args) throws Cance
 			}
 
 			if (index < -1 || index > 12) {
-				throw new ConfigRuntimeException("get_server_info expects the index to be between -1 and 11 (inclusive)",
+				throw new ConfigRuntimeException("get_server_info expects the index to be between -1 and 12 (inclusive)",
 						ExceptionType.RangeException, t);
 			}