Re-add signalling to the module lineup - works again!

README.markdown

@@ -172,7 +172,7 @@ Here's a list of modules bundled with the game by default (as of this writing an
 * [Portals](https://github.com/Terasology/Portals) - allows placement of portal blocks that'll spawn Oreons `giveBlock "portal"`
 * [Rails](https://github.com/Terasology/Rails) - Railroads and trains! Press 'e' to start a caboose or enter a cart. Use the wrench to attach carts
 * [Sample](https://github.com/Terasology/Sample) - miscellaneous example content showcasing module usage
-* ~~[Signalling](https://github.com/Terasology/Signalling) - circuitry implementation based on BlockNetwork, similar to redstone~~
+* [Signalling](https://github.com/Terasology/Signalling) - circuitry implementation based on BlockNetwork, similar to redstone
 * [Soils](https://github.com/Terasology/Soils) - a small pack of different soil types
 * [Spawning](https://github.com/Terasology/Spawning) - split out from Portals to serve as general utility for anything needing stuff to spawn
 * [StructuralResources](https://github.com/Terasology/StructuralResources) - a set of structural shapes suitable for buildings and such