Display active status of connections.

guacamole/src/main/webapp/styles/login.css

@@ -293,6 +293,12 @@ div#recent-connections div.connection {
     padding: 0.1em;
 }
 
+.connection .usage {
+    float: right;
+    font-style: italic;
+    color: gray;
+}
+
 .connection .thumbnail {
     margin: 0.5em;
 }