Feature/sherable buttons

added sherable buttons and seo 
And they should remain in that gem, not ours.

> On 23 Oct 2014, at 12:37, Marcu Alexandru <notifications@github.com> wrote:
> 
> In config/locales/social_share_button.en.yml:
> 
> > @@ -0,0 +1,18 @@
> > +en:
> that is what the shareable gem uses.
> 
> —
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