-Changed xeno to have a safe way to hatch eggs with plasma.

http://imgur.com/80LJx

-Added a turf meter which shows the air contents of a tile.
-Added a simple vent controller for the dual vents.

git-svn-id: http://tgstation13.googlecode.com/svn/trunk@4935 316c924e-a436-60f5-8080-3fe189b3f50e

code/ATMOSPHERICS/components/binary_devices/dp_vent_pump.dm

@@ -145,9 +145,9 @@
 			set_frequency(frequency)
 
 	receive_signal(datum/signal/signal)
+
 		if(!signal.data["tag"] || (signal.data["tag"] != id) || (signal.data["sigtype"]!="command"))
 			return 0
-
 		if("power" in signal.data)
 			on = text2num(signal.data["power"])