Address Administrative Area options variable

@sergii-tkachenko Can you please review?

Sets a variable of State options to use in dropdowns where we also collect additional User addresses, to fix bug reported in comments of https://jira.dosomething.org/browse/DS-452

Adds a function `dosomething_user_set_address_administrative_area_options` to use for international sites (e.g. `drush php-eval "dosomething_user_set_address_administrative_area_options('CA')")` will populate the options for Canada.
Ok, for now I'm going to make this change in order to set it for US, and then call the `dosomething_user_set_address_administrative_area_options` function in a update hook within the DS Canada module.