Merge pull request #3794 from jhamrick/docs-logo-link

In the docs, change logo link to ipython.org

docs/source/_templates/layout.html

@@ -1,23 +1,23 b''
 {% extends "!layout.html" %}
 
 
 {% block rootrellink %}
-        <li><a href="{{ pathto('index') }}">home</a>|&nbsp;</li>
+        <li><a href="http://ipython.org">home</a>|&nbsp;</li>
         <li><a href="{{ pathto('search') }}">search</a>|&nbsp;</li>
        <li><a href="{{ pathto('index') }}">documentation </a> &raquo;</li>
 {% endblock %}
 
 
 {% block relbar1 %}
 
 <div style="background-color: white; text-align: left; padding: 10px 10px 15px 15px">
-<a href="{{ pathto('index') }}"><img src="{{
+<a href="http://ipython.org/"><img src="{{
 pathto("_static/logo.png", 1) }}" border="0" alt="IPython Documentation"/></a>
 </div>
 {{ super() }}
 {% endblock %}
 
 {# put the sidebar before the body #}
 {% block sidebar1 %}{{ sidebar() }}{% endblock %}
 {% block sidebar2 %}{% endblock %}