Add social share buttons for posts

_layouts/post.html

@@ -10,9 +10,10 @@ layout: base
       <article role="main" class="blog-post">
         {{ content }}
       </article>
+      {% include social-share.html %}
       {% if page.tags.size > 0 %}
         <div class="blog-tags">
-          Tags: 
+          Tags:
           {% if site.link-tags %}
           {% for tag in page.tags %}
             <a href="/tag/{{ tag }}">{{ tag }}</a>
@@ -34,7 +35,6 @@ layout: base
         </li>
         {% endif %}
       </ul>
-      
 	    {% if page.comments %}
         <div class="disqus-comments">
 	        {% include disqus.html %}