Add school links to navigation

app/views/layouts/_navigation.html.erb

@@ -83,6 +83,11 @@
         <li>
           <%= link_to fa_icon("envelope fw", text: "Conversations"), conversations_path %>
         </li>
+        <% for school in (current_user.schools_administering + [current_user.school]).uniq do %>
+          <li>
+            <%= link_to fa_icon("building fw", text: school.name), school_path(school) %>
+          </li>
+        <% end %>
       </ul>
     </div>
   </div>