Sample of using build info to generate keystrokes (#412)

* More documentation

* Saving crontab for user  on host

* Restructuring in keeping with recent changes to conventions

* Simplify submitting my fave cbbrowne keystroke by using SEND_STRING()

* Local change, not apropos to have in this repo

* Simplify logic; no need to return so much

* Add in a version key

* Add docs

* Split build date into a separate DEFINE

* Ensure there is a value even if not working within a git repo

* Should not include the compiled code in the repo

* compiled.hex files should not be included in the repo; they represent generated compiled code

* Fix spelling in comment

* Remove more generated files

* Add rule to ignore contents of .build directories; their contents are generated

* Revert removals of compiled files

keyboard/planck/keymaps/cbbrowne/readme.md

@@ -28,7 +28,8 @@ doing sundry experimentation:
      to use it, but hey, it shows how others might use this facility
      in a more useful context.
    - Key [2][2] aka "a" uses a random number generator to select a digit 0-9 at random
-   - Key [3][2] aka "z" uses a random number generator to select a letter a-z at random	 
+   - Key [3][2] aka "z" uses a random number generator to select a letter a-z at random
+   - Key [1][3] aka "e" spits out the keymap version number
 
 2. Some code structure ideas
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