WooCommerce Social Login 2.15.1

* Fix - Ensure styles & scripts are loaded where needed when "WooCommerce" string is translated
* Misc - Added support for WooCommerce 3.0
* Misc - Removed support for WooCommerce 2.4

* Fix - Make sure provider notices text can handle translations correctly
* Localization - Updated Italian translation

* Fix - Fix login issues on subdirectory installs