automatically forward ergodox ez

Merge pull request #597 from Jiehong/feature/basic_keyboard_doc

feature: add basic doc about how a keyboard works on USB

Merge pull request #596 from fredizzimo/rid_of_quick

Fix the makefile dependencies and remove quick targets

feature: add basic doc about how a keyboard works on USB

This comes from the discussion on #520

Travis calls the normal build target, instead of quick

Fix the readme for the removed quick target

Remove the quick commands and add proper clean

Also depend on the gcc version

Generate version information to version.h

So that only the files that really needs a version are recompiled.

Force compilation and linking when options changes

More reliable .d file generation

Also generated inside the obj dir instead of separate deps folder.

Put the build output inside the root/.build directory

Enable vpath seraching for source files only

Better "include guards" for the makefiles

Checking for ARCH is not good enough, since some subprojects define it.
Ergodox Ez for example. The leads to running the make from
keyboards/ergodox/ez failing. The keyboard makefile will not be included
in that case, and therefore not the CUSTOM_MATRIX either.

Furthermore the output files are read from many different .build
directories, so it doesn't fail deterministically. For example on the
Travis CI the compilation passes, since there's no outdated objects that
needs recompilation.

Merge pull request #594 from jeebak/jeebak

Jeebak's keymap for planck

Merge pull request #590 from jeebak/in-like-flint

Add IN_LIKE_FLINT song

Update readme.md

Add additional shortcut keymaps to TOUCHCURSOR layer

Add additional maps for [, and ], to LOWER

Make RAISE layer an all numbers/arithmatic layer