Fix weird emoji margin and padding.

Thanks, I knew that but forgot.

Sent from my Phone

> On Jul 30, 2014, at 5:12 PM, "Steffen Bruchmann" <notifications@github.com> wrote:
> 
> In stylesheets/stylesheet.css:
> 
> > @@ -421,3 +421,9 @@ Small Device Styles
> >    }
> >  
> >  }
> > +
> > +.emoji {
> > +    margin: 0px;
> A very small nitpick: You can omit units in CSS if the value is zero, because there’s no difference between 0px and 0vmin for example.
> 
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