Adding NKRO virtual dip-switch, using existing bit in keymap byte.
This takes the last, reserved bit there, but doesn't necessitate
a revision to the magic number because it doesn't alter byte order.
Add reference to NKRO virtual dip-switch to documentation.
Merge pull request #112 from shayneholmes/ee_nkro_use_reserved_bit

Adding NKRO virtual dip-switch, using existing bit in keymap byte.