Docs "Customize and Download" button didn't send the correct parameters

The "Download and Customize" button was not working as expected the following problems were fixed:

* The click handler wasn't preventing default which caused the page to jump to the top
* The ajax post was ALWAYS go to the heroku app because the check for dev/prod was incorrect
* The post send empty arrays as parameters because it was not selecting the correct divs to gather the input values.