webui: enhance led config (#224)

* split content and js
tune leds config

* implement connection lost page

* split js/html in huebridge

* add js action for connection lost

assets/webconfig/content/connection_lost.html

@@ -0,0 +1,16 @@
+<div id="wrapper">
+	<div class="container-fluid">
+		connection lost: <a href="/">reconnect</a>
+	</div>
+</div>
+
+<script>
+function connectionLostAction()
+{
+	// demo code to see if this works
+	$("#wrapper").css("margin","auto");
+	$("#wrapper").css("background-color","#BBBBBB");
+}
+</script>
+
+