support external links in navbar; fixes #3

_includes/nav.html

@@ -13,10 +13,25 @@
     <div class="collapse navbar-collapse" id="main-navbar">
       <ul class="nav navbar-nav navbar-right">
 	    {% for link in site.navbar-links %}
+	      {% capture before %}{{ link[1] | split: "://" | first }}{% endcapture %}
+	      {% capture after %}{{ link[1] | split: "://" | last }}{% endcapture %}
         <li>
-		  <a href="{{ site.baseurl }}/{{ link[1] }}">{{ link[0] }}</a>
-		</li>
-		{% endfor %}
+          {% assign internal = true %}
+          {% if before != after %}
+            {% if before == "http" or before == "https" %}
+              {% assign internal = false %}
+            {% endif %}
+          {% endif %}
+
+        {% if internal %}
+          {% capture linkurl %}{{ site.baseurl }}/{{ link[1] }}{% endcapture %}
+        {% else %}
+          {% capture linkurl %}{{ link[1] }}{% endcapture %}
+        {% endif %}
+
+	      <a href="{{ linkurl }}">{{ link[0] }}</a>
+	      </li>
+	    {% endfor %}
       </ul>
     </div>
 
@@ -31,4 +46,4 @@
 	{% endif %}
 
   </div>
-</nav>  
+</nav>