removed windows layer and updated brightness keys for macOS Sierra

changed RALT to LALT on Windows

fixed comments

Update readme.md

Update readme.md

updated readme

added close key for alt-f4 macro

added a toggle between Mac and Windows base layers (with swapped cmd and ctrl)

Merge pull request #790 from IBNobody/master

Fix #770, Fix #779, Update Vision

Fix #770, Fix #779

Merge remote-tracking branch 'refs/remotes/jackhumbert/master'

Updating Vision to beta layout.

Merge pull request #786 from mannkind/patch-1

Fix lets_split.c so that audio can be disabled

Fix lets_split.c so that audio can be disabled

Matching the use of `#ifdef AUDIO_ENABLE` used in `matrix_init_kb()` in order to compile firmware for the Let's Split keyboard without audio enabled.

Merge remote-tracking branch 'refs/remotes/jackhumbert/master'

Merge pull request #785 from jcowgar/master

Added Jeremy’s Atreus Layout

Merge pull request #784 from Dbroqua/master

Added dbroqua layout for HHKB keyboard

Merge pull request #781 from cbbrowne/master

Recent enhancements to keyboard map

Added Jeremy’s Atreus Layout

- Added dbroqua layout for HHKB keyboard