fixes date display on customer list page
fixed docblock for WC_Product::get_children(), closes #4664
fixed the indentation in includes/abstracts/abstract-wc-product.php file
fixed some coding standards in includes/abstracts/abstract-wc-product.php
removed unused global vars in WC_Report_Coupon_Usage::output_report, closes #4665
fixed docblock for WC_API_Customers::query_customers, closes #4666
fixed docblock for WC_Order::get_formatted_line_subtotal, closes #4667
fixed the indentation in includes/class-wc-order.php
fixed some coding standards in includes/class-wc-order.php
updated the WC_Order version to 2.1.0
fixed docblock for meta_is_product_attribute() function, closes #4668
fixed the indentation in includes/wc-conditional-functions.php
fixed undefined username variable in myaccount register using registration generate username as true
fixed the indentation in includes/class-wc-form-handler.php
fixed some coding standards in includes/class-wc-form-handler.php
$tax_code was url encoded , so decode it.

I can't read tax code at this box, if used Japanese in tax code. I want to read it in Japanese, so decode here.
Load Chosen on My Account page for country and state address edits, closes #4674
Update readme.txt
removed deprecated function
improved the deprecated woocommerce_placeholder_img function, closes #4684