adding titles and summaries to social media share links

I added parameters into the links instead of using Open Graph tags (og tags) as discussed with Dak. OG tags give us more control over what displays when shared, especially in Twitter. But, this is still a big improvement over what we have now.
I am now pulling it from abstract.

On Fri, Oct 10, 2014 at 10:57 PM, Derek Kent <notifications@github.com>
wrote:

> In src/scripts/helpers/backbone/views/base.coffee:
>
> > @@ -91,9 +91,25 @@ define (require) ->
> >
> >        return data
> >
> > +    addOpenGraphMetaTags: () ->
> > +      url = window.location.href
> > +      description = $('.summary').text() or 'An OpenStax College book.'
>
> You should be getting it from the model.
>
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