If you try to use the teleporter and the teleport was rejected for any reason (like having a nuclear disk), you won't get the chance to get a random damage from the teleport.

Fixes issue #2236.
Removed some spawn() calls.
Removed the chance of fail from the portal effects (the blue portals made with hand teleporters).
The portal datums will now return 0 if the teleport failed, and now use a new proc, start(), instead of New() to handle themselves.
Standarized teleport.dm from the helper_datums folder.
Removed the checks for centcomm z level and away missions z level for teleports. Now you can go there.
changed the /red messages from the teleports datum to span classes.
The "[something] bounces off of the portal!" were replaced for "The portal rejects [something]".
Removed an extra "the" on those messages.

code/game/objects/effects/portals.dm

@@ -5,22 +5,15 @@
 	icon_state = "portal"
 	density = 1
 	unacidable = 1//Can't destroy energy portals.
-	var/failchance = 5
 	var/obj/item/target = null
 	var/creator = null
 	anchored = 1.0
 
 /obj/effect/portal/Bumped(mob/M as mob|obj)
-	spawn(0)
-		src.teleport(M)
-		return
-	return
+	src.teleport(M)
 
 /obj/effect/portal/Crossed(AM as mob|obj)
-	spawn(0)
-		src.teleport(AM)
-		return
-	return
+	src.teleport(AM)
 
 /obj/effect/portal/New(loc, turf/target, creator, lifespan=300)
 	portals += src
@@ -52,9 +45,5 @@
 		qdel(src)
 		return
 	if (istype(M, /atom/movable))
-		if(prob(failchance)) //oh dear a problem, put em in deep space
-			src.icon_state = "portal1"
-			do_teleport(M, locate(rand(5, world.maxx - 5), rand(5, world.maxy -5), 3), 0)
-		else
-			do_teleport(M, target, 1) ///You will appear adjacent to the beacon
+		do_teleport(M, target, 1) ///You will appear adjacent to the beacon