Inital support for multi-tab loging

web/templates/footer.html

@@ -1,7 +1,7 @@
 {{define "footer"}}
 <div class="footer-pane col-xs-12">
     <div class="col-xs-12">
-        <span class="pull-right footer-site-name">{{ .ClientProps.SiteName }}</span>
+        <span class="pull-right footer-site-name">{{ .ClientCfg.SiteName }}</span>
     </div>
     <div class="col-xs-12">
         <span class="pull-right footer-link copyright">© 2015 Mattermost, Inc.</span>