Make GroovePlayer a singleton to avoid being created for each browser. Add login UI component to eventually hold landing screen. Actually start server with initial interface.

src/WebInterface.cpp

@@ -18,3 +18,25 @@
  */
 
 #include "WebInterface.h"
+#include "ui/LoginInterface.h"
+#include <Wt/WText>
+
+struct WebInterface::internal
+{
+    LoginInterface* loginUI;
+};
+
+WebInterface::WebInterface(const Wt::WEnvironment& env) : Wt::WApplication(env)
+{
+    priv_int = new internal;
+    setTitle("Arbitrateor - Audio Jukebox");
+    priv_int->loginUI = new LoginInterface(this);
+    root()->addWidget(priv_int->loginUI);
+}
+
+void WebInterface::loginCompleted()
+{
+    //Login completed, now bring up main inteface.
+    root()->removeWidget(priv_int->loginUI);
+    root()->addWidget(new Wt::WText("you did it"));
+}