style out front matter authorship (fixes #24 and #25)

Author: tigerhawkvok

Diff for: _layouts/default_toc.html

@@ -38,7 +38,7 @@
       </div>
       <article class="wrapper">
         {{ content }}
-        <div class="post-content-footer">
+        <div class="post-content-footer text-muted">
           {% if page.date %}
           last edited {{page.date | date_to_long_string }}
           {% endif %}

Diff for: _sass/_base.scss

@@ -225,3 +225,7 @@ color: red;
 .bloptional {
   color: green;
 }
+
+.post-content-footer {
+  font-style: italic;
+}