Remove humans.txt reference.
Update screenshot.
Add readme.txt
Rename admin-preview.js to admin-customizer.js
Remove empty defaults from get_theme_mod().
Properly enqueue the theme customizer script.
Correct inline documentation.
Add SubtlePatterns.com patterns.

The patterns are pulled from the GitHub repository at
https://github.com/subtlepatterns/SubtlePatterns, then sideloaded into
the media library when saving. Thanks to subtlepatterns.com for
providing an amazing resource of beautiful patterns.