add "Build your own firmware" and "Features" section to README.

add a build option: USB_EXTRA_ENABLE

add error handling to ps2_mouse

Add PS/2 mouse support to connect TrackPoint Unit.

Change build options:  Makefile and config.h. See README.

change keyboard report descriptor for NKRO.
It uses 1byte for modifiers and 15bytes(120bits) for keys now.

add build option: NKRO_ENABLE(remove: USB_12KRO)

tuning layer switch timing.

add build option USB_12KRO.

support 12KRO

add system controls(power down/wake up) from generic desktop page(HID)

add audio controls from consumer page(HID)

change hhkb/keymap

Merge branch 'led'

output previous key state on TP1684 when scaning  matrix.

FIX: LED debug

repeating Fn key: press twice quickly to repeat.

revise Fn key processing.

improve layer switching

ADD: macway/doc
FIX: keymap

v2.0: HHKB/Macway support merged