[Erez & Jack] Examples for advanced macro stuff

Merge pull request #282 from jasontwong/master

Add new keymap

adds revisions of .hex files for planck/preonic

removes old .hex files

updates default voice, prunes voices

addresses memory limits concerns for atomic default makefile

updates preonic default keymap

updates planck default keymap

Compiled Hex File

The keymap file to use without compilation.

updating personal atomic keymap (#285)

Merge pull request #280 from Twey/master

Add `quantum/keymap_extras/keymap_plover.h` and a keymap.

Add Twey's keymap

Update keymap image

Why:

* The transparency made it ugly.

This change addresses the need by:

* Make transparent parts white.

adds voice iteration to planck default

Add new keymap

Why:

* I want a custom keymap that suits my needs.

This change addresses the need by:

* Cloned default keymap.
* Customized layout.
* Updated README.
* Add an image created from keyboard layout editor.

Add a keymap_extras header for Plover

Fix typo (#276)

adds more voice harmonics

Merge remote-tracking branch 'origin/master'

# Conflicts:
#	quantum/audio/voices.c

adds fifth and fourth down voices