Update classes/integrations/google-analytics/class-wc-google-analytics.php

Added use of product SKU to "Add to cart" event.
Update templates/loop/add-to-cart.php

Added data-product_sku attribute to allow SKU tracking in analytics from shop loop.
Update classes/integrations/google-analytics/class-wc-google-analytics.php

Added SKU tracking for shop loop
Merge pull request #2441 from yitzchak/patch-2

Update classes/integrations/google-analytics/class-wc-google-analytics.p...
escape for #2441
Force_ssl handling #2442
Fix lightbox Closes #2451.
Make my order filters more flexible
Merge pull request #2452 from krbvroc1/order_status_actions

Make my_order filters more flexible
Tidied up order display #2452 Added new line count function
'for'
Un-needed clear
Record all discounts. Closes #2455.