Allow BlockExtenders to transmit any received redstone signal to its con...


...nected tile

 - The facing direction of the block extender is the only output side for the redstone signal, while all the others sides are redstone signal inputs only
 - Redstone dust particles appear while it is receiving/transmitting a signal
 - Not implemented in buffers or the wireless block extender

![2014-01-30_01 02 34](https://f.cloud.github.com/assets/2389051/2038381/51b315d0-898d-11e3-99fb-6d0c4591439e.png)