Fix broken blog engine specs

@apcomplete - I'm going to merge this, but I wanted you to see it.

:horse: 
I setup some delegation for full name. 



> On Nov 3, 2014, at 14:24, Alex Padgett <notifications@github.com> wrote:
> 
> In engines/blog_app/app/views/blog_app/posts/_post_preview.html.haml:
> 
> > @@ -6,7 +6,7 @@
> >  
> >      .post__author
> >        %span.post__author--name{itemtype: 'http://schema.org/Person', itemscope: true}
> > -        = link_to(post.author.full_name, posts_path(author_id: post.author.id), rel: "author", itemprop: 'name')
> > +        = link_to(post.author_full_name, posts_path(author_id: post.author.id), rel: "author", itemprop: 'name')
> Didn't you remove these methods in the model?
> 
> —
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