Add social icons

From Buzza:

> Care Response are now a little more active on Social so would like to add FaceBook and Twitter icons to their site. When you have a moment could you add them for us
>
> Facebook:
> https://www.facebook.com/CareResponseUK
>
> Twitter:
> https://twitter.com/CareResponse
>
> Can we also update the Google+ link to:
> https://plus.google.com/+CareResponseSunningHill/about
>
> Attached is a visual - it’s using the same colour and FontAwesome