make variations script re-usable
backwards compat
quantity selector dot
introduced the wc_strtolower() function, closes #6575
Optimized cart get_checkout_url method.
Start of cart unit tests.
Changed pregmatch delimiters and optimized regex.
Fixes #6584.
Merge branch 'master' of github.com:woothemes/woocommerce
Regex escape mathes before using them as regex to prevent delimiter problems.
[2.2] fixed edit account page fields, closes #6577
[2.2] Fix stock report queries Closes #6565
[2.2] Fix error message with maximum amount

Fixes #6567
Fix 2.3 plain text emails
WP remote GET test for updater

cc @kloon @ChromeOrange
Avoid notice errors with W3 Total Cache

Avoid errors in the admin with W3 Total Cache when you add an extra space by mistake.
alt attribute from paypal logo now is translatable
Load billing and shipping address when get the values in checkout, closes #6590
Removed the frontend styles setting #6589
Unit Testing: Added test_add_to_cart_simple and test_add_to_cart_variable methods.
Unit Testing: Added a product helper class.