Add files for onekey(issue #56)

- https://github.com/tmk/tmk_keyboard/issues/56
Change ADB scan delay 12ms
Add ADB protocol files from blargg's work

- <http://geekhack.org/index.php?topic=14290.msg1070604#msg1070604>
Merge blargg's fix into adb.c

- <http://geekhack.org/index.php?topic=14290.msg1075201#msg1075201>
Delete MOUSEKEY_DELAY_TIME in config.h
Add USE_LEGACY_KEYMAP in config.h of ps2_usb and IIgs
Merge branch 'onekey'
Add cli() to protoect ADB critical timing part
Fix ADB led_set(); remove delay

- the 100ms delay causes keystroke drop; this is observable with
  pressing Numlock key on AEK repeatedly
- without the delay LED sync problem doesn't occur now
Disable BOOTMAGIC and fix debug prints of adb_usb
Remove tentative files from blargg
Merge remote-tracking branch 'tmk/master' into hhkb-ex-dev