added optional author blogpost display

templates/blog-page.html

@@ -3,7 +3,9 @@
 {% block content %}
 <div><a href="..">..</a>/<span class="metaData">{{ page.slug }}</span></div>
 <time datetime="{{ page.date }}">Published on: <span class="metaData">{{ page.date }}</span></time>
+{% if config.extra.author and config.extra.display_author == true %}
 <address rel="author">By <span class="metaData">{{config.extra.author}}</span></address>
+{% endif %}
 <h1>{{ page.title }}</h1>
 
 {% if page.toc and page.extra.toc %}