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/readme.md

@@ -0,0 +1,33 @@
+# ErgoDox EZ
+
+The Ez uses the [Teensy Loader](https://www.pjrc.com/teensy/loader.html).
+
+Linux users need to modify udev rules as described on the [Teensy
+Linux page].  Some distributions provide a binary, maybe called
+`teensy-loader-cli`.
+
+[Teensy Linux page]: https://www.pjrc.com/teensy/loader_linux.html
+
+To flash the firmware:
+
+  - Build the firmware with `make keymapname`, for example `make default`
+  - This will result in a hex file called `ergodox_ez_keymapname.hex`, e.g.
+    `ergodox_ez_default.hex`
+
+  - Start the teensy loader.
+
+  - Load the .hex file into it.
+
+  - Press the Reset button by inserting a paperclip gently into the reset hole
+    in the top right corder.
+
+  - Click the button in the Teensy app to download the firmware.
+
+To flash with ´teensy-loader-cli´:
+
+  - Build the firmware with `make keymapname`, for example `make default`
+
+  - Run ´<path/to/>teensy_loader_cli -mmcu=atmega32u4 -w ergodox_ez_<keymap>.hex´
+
+  - Press the Reset button by inserting a paperclip gently into the reset hole
+    in the top right corder.