Upgrading Casper to 2.5.1

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

package.json

@@ -2,7 +2,7 @@
     "name": "casper",
     "description": "The default personal blogging theme for Ghost. Beautiful, minimal and responsive.",
     "demo": "https://demo.ghost.io",
-    "version": "2.5.0",
+    "version": "2.5.1",
     "engines": {
         "ghost": ">=2.0.0"
     },

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>