Optimize matrix scanning (#343)

Leader key implementation (#326)

* implements leader key for planck experimental

* allows override of leader timeout

* adds ability to use the leader key in seq

* fixes leader keycode

* adds chording prototype

* fixes keycode detection

* moves music mode to quantum.c

* disables chording by default

* updates process_action functions to return bool

Merge remote-tracking branch 'upstream/master'

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

moves backlight functionality to keyboard files and updates template makefile

previously there were two backlight.c files (bad)

Merge pull request #5 from jackhumbert/master

Sync with upstream

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware into modifier-release-fix

Merge branch 'master' of https://github.com/sboesebeck/qmk_firmware

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

Merge branch 'master' of https://github.com/jackhumbert/tmk_keyboard

Merge pull request #224 from NoahAndrews/make-keymap-names-consistent

Make keymap names more consistent

Updated several keyboard folders to use new keymap naming scheme

Merge remote-tracking branch 'jackhumbert/master' into make-keymap-names-consistent

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

Merge pull request #219 from IBNobody/master

Master

Minor Tweaks and Documentation

Fixed compiler warning by including bootloader.h in keymap_common.c.

Changed FORCE_NKRO to only be applied if NKRO_ENABLE is defined.

Added extra documentation to the template config.h

Merge remote-tracking branch 'jackhumbert/master' into improve-buildguide

Merge remote-tracking branch 'origin/master'

Merge branch 'master' of https://github.com/jackhumbert/qmk_firmware

Merge pull request #214 from cdlm/action-hook

Add per-event user hook function