Show sub-namespaces on namespace page

I found some issues with this PR, so I'm working on an alternative that I'll submit this weekend.

> On Aug 23, 2014, at 1:39 AM, Alexander Obuhovich <notifications@github.com> wrote:
> 
> In Sami/Resources/themes/default/pages/namespace.twig:
> 
> > @@ -22,7 +35,7 @@
> >              {% endfor %}
> >          </table>
> >      {% endif %}
> > -
> > +    
> I guess this was added by mistake.
> 
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