Add IN_LIKE_FLINT song

Merge pull request #589 from algernon/h/ergodox_ez-vs-ergodox

Update some obsolete references

Update some obsolete references

Some links were still pointing to `/keyboards/ergodox_ez`, while the
directory is `/keyboards/erdogox` now.

Not all references have been updated, and some of the text here and
there may need updating to mention the ErgoDox Infinity too, but that's
out of the scope for this quick fix.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>

Merge pull request #587 from fredizzimo/documentation_quick_fix

Fix the quick aliases documentation section

Merge pull request #503 from fredizzimo/ergodox_subproject

Add both Ergodox EZ and Infinity Ergodox as sub-projects of Ergodox

Fix the quick aliases documentation section

Also move all keyboard customization documentation under the
"Going Beyond the keycodes" heading.

Small fix for infinity include guard

Fix typo in the readme.

A couple of more Ergodox readme fixes

Unify the ErgoDox EZ and Infinity documentation

Refer to the right path in the readme

Move Ergodox readme from ez subfolder to parent

Include the main Makefile before including Ergodox infinity drivers

Move Infinity Ergodox drivers to subproject, and fix makefile

Remove the Infinity Ergodox default keymap

Cleanup the townk_osx config.h and make files

Rename supercoder config_user to config.h

Also fixup the include path of parent config

Fix config.h include guards

Define weak matrix user function for Infinity Ergodox

So that a few keyboards, which don't use them, links properly.

Speed up ChibiOS keymap compilation

By sharing the external library object files between the whole
keyboard, instead of re-compiling them for each keymap.