Social Links: add Google+ to the list of supported services
Merge pull request #19 from jeherve/social-links-google

Social Links: add Google+ to the list of supported services
Social Links: add missing trailing comma
Thanks @nb for the recommendation!
https://github.com/Automattic/Jetpack/commit/124b2fae09f37bd19a20af25d13ba2496823e0c4#commitcomment-4906602