Squashed 'tmk_core/' changes from dc0e46e..57d27a8

Squashed 'tmk_core/' changes from dc0e46e..57d27a8

57d27a8 Merge branch 'core_update_150924' into core
024abe3 core: Fix NKRO ifdef
7aa2d30 core: Fix for disabling NKRO in Boot protocol
95651fd core: Fix message print of debug command
c20cd29 lufa: Fix endpoint bank mode for ATMega32u2
82ac21f next_usb: Fix next_kbd_set_leds()
537d9c7 Change to KC_BOOTLOADER(KC_BTLD)
f2b3772 Add an assignable RESET key
fc99257 Fix parenthesis
e852582 Fix weak modifier clear in action macro
c2a6c5c core: Fix lufa suspend callback(#234)
fa548c5 usb_usb: Ignore error usage(0x01-03) report
513d95c usb_usb: Support locking key indicator LED
cd78802 core: Add keymap section ldscript for ATMega32U2
70c9abd Add description for non-US keys on keycode.h
538c192 lufa: Fix console flush #223
87628c9 Revert "Make action_for_key a weak symbol"
3c0a1ba Make action_for_key a weak symbol
6bb0d7d ibm4704_usb: Fix protocol handling
b6ef5cf Add keyboard_setup() and matrix_setup()
f4bb8b2 ibm4704_usb: Fix interrupt of clock(rising edge)
0c1fcc1 usb_usb: Change debug LED pin config
595710d Reduce code size of magic commands
6bed174 Add description of AVR bootloader and boot section
54c6a01 Merge commit 'f6d56675f9f981c5464f0ca7a1fbb0162154e8c5'
d18d42e Merge branch 'core-update2' into core
febec88 Add compile options '-fdata-sections'

git-subtree-dir: tmk_core
git-subtree-split: 57d27a8e39173a589b4abae74851f95c39940174