title: Jekyll collection not working on github.pages
body: <p>Following the instructions in the Jekyll documention <a href="http://jekyllrb.com/docs/collections/" rel="nofollow">http://jekyllrb.com/docs/collections/</a>, I created a collection in my jekyll blog for developer related posts</p>
  
  <pre><code>collections:
    developer:
      output: true
  </code></pre>
  
  <p>On a jekyll page, I try to output a list of the posts like this</p>
  
  <pre><code>  &lt;ul class="posts"&gt;
      {% for post in site.developer %}
  
        &lt;li&gt;
          &lt;span class="post-date"&gt;{{ post.date | date: "%b %-d, %Y" }}&lt;/span&gt;
          &lt;a class="post-link" href="{{ post.url | prepend: site.baseurl }}"&gt;{{ post.title }}&lt;/a&gt;
  
         &lt;p&gt;{{ post.excerpt }}&lt;/p&gt;
        &lt;/li&gt;
  
      {% endfor %}
    &lt;/ul&gt;
  </code></pre>
  
  <p>This works on my local machine. I can view one post from this collection at</p>
  
  <pre><code>http://localhost:4000/developer/2014-07-07-blah-blah.html  
  </code></pre>
  
  <p>and a list of the developer posts is visible on the developer page at</p>
  
  <pre><code>http://localhost:4000/developer/
  </code></pre>
  
  <p>However, the list isn't visible on github pages and I can't access the post at the url.  The blog otherwise works fine on github pages i.e. all the <code>site.posts</code> on the homepage are visible etc. </p>
  
  <p>Note, I did push the files to github. I can see them in the repo.</p>