Added banner disconnect handler and associated js/css files

inst/bannerDisconnectHandler.css

@@ -0,0 +1,62 @@
+#shiny-disdisconnecteded-overlay {
+	display: none !important;
+}
+
+#sdo-overlay {
+	overflow: hidden !important;
+	cursor: not-allowed !important;
+
+	background-color: #999999 !important;
+	opacity: 0.7 !important;
+
+	position: fixed !important;
+	top: 0 !important;
+	left: 0 !important;
+	bottom: 0 !important;
+	right: 0 !important;
+
+	z-index: 99998 !important;
+}
+
+#sdo-disconnected-dialog {
+	border-radius: 3px !important;
+	box-shadow: rgba(0, 0, 0, 0.3) 3px 3px 10px !important;
+
+	background: rgba(64, 64, 64, 0.9) !important;
+	color: #FFFFFF !important;
+	opacity: 1 !important;
+
+	text-align: center !important;
+	font-size: 50px !important;
+
+	position: fixed !important;
+	top: 50% !important;
+	left: 50% !important;
+	bottom: auto !important;
+
+	height: auto !important;
+	width: 100% !important;
+
+	padding: 0.8em 1.5em !important;
+
+	transform: translateX(-50%) translateY(-50%) !important;
+
+	z-index: 99999 !important;
+}
+
+#sdo-disconnected-dialog label {
+	display: none !important;
+}
+
+#sdo-disconnected-dialog a {
+	display: 'block' !important;
+	color: #337ab7 !important;
+	font-size: 50 !important;
+	font-weight: normal !important;
+	margin-top: 70px !important;
+}
+
+#sdo-disconnected-dialog {
+	padding: 15px !important;
+	box-shadow: none !important;
+}