* restructure converters
each converter is its own keyboard and different hardware variants are different subprojects.
remove (seemingly) old method of loading layouts from main Makefile
* call led_set_kb() from overridden led_set()
* put converter back into one folder
* revert some structure changes to bring in line with #1784.
Also attempt to get the BLE thing more properly integrated.
Also also fix led_set() to call led_set_kb().
* Remove all Makefiles from the keyboards directory.
* update keymaps added in the last 8 days
* Ignore keyboard/keymap makefiles
* update hand_wire to reflect our new Makefile-less reality
* Update the make guide to reflect the new reality
* move planck keymap options to rules.mk
* update planck keymaps 4real
* trigger travis
* add back build_keyboard.mk
* restore changes to build_keyboard
