Update Google plus icon

[ekerazha]

The official Google Plus badge is a circle.
See: https://developers.google.com/%2B/web/badge/#static-badge

[TheChen5]

If you want it for a website, you can stack the google-plus and circle icons.
http://fortawesome.github.io/Font-Awesome/examples/#stacked

[tagliala]

@ekerazha is right, the official logo should be implemented

(but even with the official logo things will not change, someone will ask for a non official logo e.g.: #1966)

[ekerazha]

@tagliala @davegandy Is there a reason why this issue hasn't been worked on for the latest releases?

[tagliala]

@ekerazha yes, there is: I forgot of this issue and I didn't reassing it to 4.5.0/4.6.0 milestone, sorry

[davegandy]

Added to milestone wip branch. Closing.