Initial support for supplying kernel logos in kernel spec

IPython/html/static/notebook/js/kernelselector.js

@@ -85,6 +85,7 @@ define([
         this.events.on('spec_changed.Kernel', function(event, data) {
             that.current_selection = data.name;
             that.element.find("#current_kernel_spec").find('.kernel_name').text(data.display_name);
+            that.element.find("#current_kernel_logo").attr("src", "/kernelspecs/"+data.name+"/logo-32.png");
         });
         
         this.events.on('kernel_created.Session', function(event, data) {

IPython/html/templates/notebook.html

@@ -42,6 +42,7 @@ class="notebook_app"
 </span>
 
 <span id="kernel_selector_widget" class="pull-right dropdown">
+  <img id="current_kernel_logo" src="/kernelspecs/python/logo-32.png"/>
   <button class="dropdown-toggle btn btn-sm navbar-btn" data-toggle="dropdown" type='button' id="current_kernel_spec">
     <span class='kernel_name'>Kernel</span>
     <span class="caret"></span>