Added vk.com likes

Added support for [vk.com likes](https://vk.com/developers.php?p=Like).

Examples only work on localhost.com domain (because of the limitations of vk.com API).
You'll need to add this to your hosts:
127.0.0.1	localhost.com

You'll have to generate your site API_ID in vk.com and add this id to `data-vk-api` attribute.