Add submodule legitimate USB_Host_Shield_2.0

Remove submodule USB_Host_Shield_2.0

Fix print init; print_set_sendchar in main

Change USB PID

usb_usb: Update for new core layout

hhkb: Change keymap and bootmagic salt key

Merge branch 'u2_fix'

Fix endpoint buffer setting for AT90USB82/162.

Merge branch 'merge_rn42'

Change key_t to keypos_t

Fix debug.h

Merge branch 'rn42' into merge_rn42

Conflicts:
	.gitignore
	common.mk
	common/debug_config.h
	common/print.h

Update doc

Remove MCU dependent code from common/keyboard.c

Matrix power saving

USB initialize when plug-in during battery powered

ps2_usb: Fix README

adb_usb: Remove old comment of Makefile

Merge branch 'action_fix'

Add initializer of debug_config for GCC < 4.6.0(#144)