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

keyboards/ergodox_ez/keymaps/default_osx/readme.md

@@ -0,0 +1,8 @@
+# The OSX Friendly Version of the Default Firmware
+
+So, I took the default firmware and just made a couple of tweaks that make it easier to use with OS X:
+
+1. The Cmd key is now on the right side, making Cmd+Space easier.
+2. The media keys work on OSX (But not on Windows).
+
+![default osx](https://i.imgur.com/z0aqFDq.png)