Uc 44 Marketing email opt in

Adding marketing opt-in checkboxes to the facebook modal and the signup form.

The state of the checkbox is different depending on where the user is located. If they are in Canada, the checkbox is visible and unchecked. If they are in Europe, the checkbox is visible and checked. Anywhere else, the checkbox is hidden and checked. 
It will be nice to have this in a function named something like `getGeoCode()`. Then we can have already defined 'constants' for eu, ca, ...
Init function calls `getGeoCode()` once and the compares its value to constants.