Removed composer.lock file from Git ignore and added WordPress content folder.
Added http://wpackagist.org/ and WordPress Pay Extensions library for WooCommerce.
Added Composer lock file.
Use the WooCommerce extension class from the WooCommerce WordPress Pay Extensions library.
Removed unused WooCommerce classes, these are now part of the WooCommerce WordPress Pay extensions library.
Also exclude the 'wp-content' folder.
Updated translation files.
Updated Composer lock file.