🐛 Fixed image positioning on pages

closes https://github.com/TryGhost/Casper/issues/473
- added missing `<div class="post-content">` wrapper around `{{content}}`

page.hbs

@@ -27,7 +27,9 @@ into the {body} of the default.hbs template --}}
             {{/if}}
 
             <section class="post-full-content">
-                {{content}}
+                <div class="post-content">
+                    {{content}}
+                </div>
             </section>
 
         </article>