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/absenth/readme.md

@@ -0,0 +1,11 @@
+# ErgoDox EZ Absenth Configuration
+
+## Changelog
+
+
+* Sept. 14, 2016 (V0.2):
+  * Added Space Cadet to Left and Right Shift.  Pressing Left shift with no other key adds an "(" and pressing Right shift with no other key adds an ")"
+* Sept. 8, 2016 (V0.1): 
+  * Made A key double as MEDIA Layer change when you hold it.  Added mouse buttons to the large thumb buttons on the left side on the Media Layer.  Added vi/vim style arrow keys on HJKL on media layer.
+
+![Absenth](https://i.imgur.com/D1enl2x.jpg)