Just a note that using the soil plugin with jquery-cdn enabled currently calls the jQuery file included with WordPress 4.5 which is jQuery version 1.12.3
The soil plugin then uses this version number to call on the Google CDN to grab jQuery, meaning it currently calls:
https://ajax.googleapis.com/ajax/libs/jquery/1.12.3/jquery.min.js
However, Google do not yet host this version of jQuery and only host upto version 1.12.2. This results in a 404 on the asset, for a temporary fix you can comment out the line add_theme_support('soil-jquery-cdn'); which will serve the jQuery file included in WordPress 4.5