I made an automatically opening and closing door using the new /setblock command. If you download the world you are welcome to destroy the landscape to explore the Redstone logic. Pretty much how it works, when you step on the pressure plates it activates four command blocks that set the 4 door blocks to air, then when you step off the plates, it inverts the signal and activates four more command blocks which replace the air blocks with wood planks. THIS IS MY OWN DESIGN, but feel free to use it in your world. :)