Small improvements

* Resettings the searchField after adding a contact and clearing the
contactsModel after adding a contact.

* Revised LoginDialoge UI

src/main/java/envoy/client/ui/ChatWindow.java

@@ -413,6 +413,10 @@ public class ChatWindow extends JFrame {
 				e.printStackTrace();
 			}
 
+			// Clearing the search field and the searchResultList
+			searchField.setText("");
+			contactsModel.clear();
+
 			// Update LocalDB
 			userListModel.addElement(contact);
 			localDb.getUsers().put(contact.getName(), contact);