[WIP] Adds reversed trinaries and digital tvalve.


![reversed](https://cloud.githubusercontent.com/assets/7339857/5254981/51286216-79ae-11e4-8aed-6e9db281465e.PNG)

Fixes the pipe dispenser.
Adds the digital tvalve to the RPD and pipe dispenser, as well as making it wrenchable and unwrenchable.
Adds reversible piping!
Needs testing.