Add initial fix for new keymap.
Fix action of system and consumer usage.
Fix bug of FAILSAFE key clear.

http://deskthority.net/workshop-f7/tmk-keyboard-firmware-collection-t4478.html#p90022
Remove DEBUG_LED from pjrc stack.
Added Initial files for gh60.
Add README and keymap layers.(GH60)
Change keymap.(gh60)
Fix debouncing code.(gh60)
Add ISO support to keymap.(hid_liber)
Add new layer actions.
Fix PWM control of LED in phantom.
Fix tap key using delaying_layer and waiting_key.
Fix waiting_keys and periodical update for delaying layer.
Add support partly for modifier with tap key.
Fix mods with tap key but some problems still exists.

- stuck tap key after tapping. seq[mods(d), key(d), mods(u), key(u)]
- tap key doesn't work when fast type. [key(d), mods(d), key(u),
  mods(u)]
Refactor struct keyevent_t.
Fix mods with tapping.
Add bootmagic keys.(hhkb)

- kick bootloader
- enable debug print
Add prototype of Action Function.
Minor fixes in keyboard.c.