Milo: Add a login url

milo/appengine/frontend/static/buildbot/css/default.css

 /* Copyright 2015 The LUCI Authors. All rights reserved.
  * Use of this source code is governed under the Apache License, Version 2.0
  * that can be found in the LICENSE file.
  */
 
 body.interface {
   margin-left: 30px;
   margin-right: 30px;
   margin-top: 20px;
   margin-bottom: 50px;
@@ skipping 253 matching lines @@
   background-color: #e88;
   border-color: #A77272;
   border-style: solid;
 }
 tr:nth-child(even) td.status-Warning{
   color: #FFFFFF;
   background-color: #fa3;
   border-color: #C29D46;
 }
 
+.account-picture {
+  border-radius: 6px;
+  width: 25px;
+  height: 25px;
+  vertical-align: middle;
+}
+
 .legend {
   border-radius: 5px !important;
   -webkit-border-radius: 5px !important;
   -moz-border-radius: 5px !important;
   width: 100px;
   max-width: 100px;
   text-align: center;
   padding: 2px 2px 2px 2px;
   height: 14px;
   white-space: nowrap;
@@ skipping 420 matching lines @@
   display: inline;
 }
 
 div.step-text:first-child {
     display: inline;
 }
 
 .verbosity-Hidden.default {
   display: none;
 }