Creates a layouts/ folder for keymaps shared between keyboards (#1609)

* include variables and .h files as pp directives

* start layout compilation

* split ergodoxes up

* don't compile all layouts for everything

* might seg fault

* reset layouts variable

* actually reset layouts

* include rules.mk instead

* remove includes from rules.mk

* update variable setting

* load visualizer from path

* adds some more examples

* adds more layouts

* more boards added

* more boards added

* adds documentation for layouts

* use lowercase names for LAYOUT_

* add layout.json files for each layout

* add community folder, default keymaps for layouts

* touch-up default layouts

* touch-up layouts, some keyboard rules.mk

* update documentation for layouts

* fix up serial/i2c switches

layouts/community/ergodox/romanzolotarev-norman-osx/readme.md

@@ -0,0 +1,41 @@
+# Roman's Layout
+
+There is only one layer, and it is  based on [Norman
+layout](https://normanlayout.info/).
+
+Looking for multiple-layer layouts?
+
+- [Symbols, arrows, plover, HJKL
+  arrows](../romanzolotarev-norman-plover-osx-hjkl/)
+- [Same with IJKL arrows](../romanzolotarev-norman-plover-osx/)
+
+[![keyboard-layout](https://i.imgur.com/U14664K.png)](http://www.keyboard-layout-editor.com/#/gists/9e89d54f1ea6eeeb7dab1b2d19d28195)
+
+## How to use Vim key
+
+It is `CTL_T(KC_ESC)` and it works this way:
+
+- Tap `CTRL/ESC` to send `ESC`.
+- Hold `CTRL/ESC` to use as `CTRL`.
+
+## How to activate N-rollover
+
+- Hold left `SHIFT` and right `SHIFT` and then tap `N`.
+
+## How to make and flash on OS X
+
+First you need to install few brew packages.
+
+```bash
+brew tap osx-cross/avr
+brew install dfu-programmer avr-libc teensy_loader_cli
+```
+
+Then you can clone this repository, make and flash your ErgoDox.
+
+```bash
+git clone https://github.com/romanzolotarev/qmk_firmware
+cd qmk_firmware/keyboards/ergodox
+# Optionally tweak ./keymaps/romanzolotarev-norman-osx/keymap.c
+SLEEP_LED_ENABLED=no LAYOUT_ergodox=romanzolotarev-norman-osx make teensy
+```