Merge upstream and update Gemfile.lock

landing.bryanroessler.com/tags.html

@@ -23,9 +23,9 @@ title: 'Tag Index'
     <div class="post-list">
         {%- for post in site.tags[tag] -%}
             <div class="tag-entry">
-                <a href="{{- site.url -}}{{- post.url -}}">{{- post.title -}}</a>
+                <a href="{{ post.url | relative_url }}">{{- post.title -}}</a>
                 <div class="entry-date">
-                    <time datetime="{{- post.date | date_to_xmlschema -}}">{{- post.date | date: "%B %d, %Y" -}}</time>
+                    <time datetime="{{- post.date | date_to_xmlschema -}}">{{- post.date | date: site.date_format -}}</time>
                 </div>
             </div>
         {%- endfor -%}