Magento添加Facebook/Pinterest open graph meta，Google商店Feed

1、修改magento head.phtml模板文件：

2、产品详情页catalog/product/view.phtml

3、产品评论页面review/helper/summary.phtml

PS：下面为官方文档的链接地址，有详细的介绍。

https://support.google.com/webmasters/#topic=3309469
https://support.google.com/webmasters/answer/146750?hl=zh-Hans
https://support.google.com/merchants/answer/188494?hl=zh-Hans


https://developers.pinterest.com/rich_pins_product/
https://developers.pinterest.com/rich_pins/validator/
https://developers.pinterest.com/rich_pins_article/


https://developers.facebook.com/docs/sharing/best-practices