Add news page (alshedivat#1085)

fixes alshedivat#993 

Also added links to news and publications from respective section
headers on the home page. Changed the colors of the header links to make
it consistent with the previous look.

_layouts/about.html

@@ -48,7 +48,7 @@ <h2><a href="{{ '/news/' | relative_url }}" style="color: inherit;">News:bangban
 
           <!-- Selected papers -->
           {% if page.selected_papers -%}
-            <h2><a href="{{ '/publications/' | relative_url }}" style="color: inherit;">selected publications</a></h2>
+            <h2><a href="{{ '/publications/' | relative_url }}" style="color: inherit;">Selected publications:newspaper:</a></h2>
             {%- include selected_papers.html %}
           {%- endif %}