New example: Multiple LED fades with callbacks.
Add led-fade-callback.js to programs.json

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Generate example markdown for led-fade-callback.js, regenerate readme

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>
Add Lyza Danger Gardner to contributors

Signed-off-by: Rick Waldron <waldron.rick@gmail.com>