Added configuration bits
Added configuration bits

From conversation with Senic:

"
Our official SDKs takes care of so called Onion-Skinning Effect. I can explain how it is enabled/disabled. Nuimo has 9x9 LED Matrix that contains 81 LEDs. We need 81 bits to bitmap the whole LED Matrix. Additionally a byte to set the brightness and a byte to set display duration. Therefore totally 13 bytes must be sent to LED characteristics. First 11 bytes represents the bitmap. 11 x 8 bits => 88 bits. In that only 81 bits are used for LEDs and the rest 7 bits are used for other configurations such as enabling Oninon-Skinning effect.  In 11th byte [000X 0001], 5th bit (X) is OnionSkin Bit. So if you don't want to have that effect, then you should keep all the last 7 bits zero.
"
nathankunicki/nuimojs