Added banner post option to put an image on post top.

layout/_partial/article.ejs

@@ -1,5 +1,8 @@
 <article id="<%= post.layout %>-<%= post.slug %>" class="article article-type-<%= post.layout %>" itemscope itemprop="blogPost">
   <div class="article-inner">
+    <% if (post.banner){ %>
+      <%- partial('post/banner') %>
+    <% } %>
     <%- partial('post/gallery') %>
     <% if (post.link || post.title){ %>
       <header class="article-header">

layout/_partial/post/banner.ejs

@@ -0,0 +1,10 @@
+<% if (post.link){ %>
+	<a href="<%- url_for(post.link) %>" target="_blank" itemprop="url"><img src="<%- post.banner %>" class="article-banner"></a>
+<% } else if (post.title){ %>
+	<% if (index){ %>
+		<a href="<%- url_for(post.path) %>" itemprop="url"><img src="<%- post.banner %>" class="article-banner"></a>
+	<% } else { %>
+		<img src="<%- post.banner %>" class="article-banner">
+	<% } %>
+<% } %>
+