Fix compile error due to RAP API renameing

Application#addThemableWidget has been renamed in RAP core to
addThemeableWidget

Change-Id: I31c491905c195409bb5e4d6808c2f515f4de36ef
Signed-off-by: Ivan Furnadjiev <ivan@eclipsesource.com>
diff --git a/examples/org.eclipse.rap.addons.dropdown.demo/src/org/eclipse/rap/addons/dropdown/demo/internal/DropDownApplication.java b/examples/org.eclipse.rap.addons.dropdown.demo/src/org/eclipse/rap/addons/dropdown/demo/internal/DropDownApplication.java
index 1320104..bcd3f77 100644
--- a/examples/org.eclipse.rap.addons.dropdown.demo/src/org/eclipse/rap/addons/dropdown/demo/internal/DropDownApplication.java
+++ b/examples/org.eclipse.rap.addons.dropdown.demo/src/org/eclipse/rap/addons/dropdown/demo/internal/DropDownApplication.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2013 EclipseSource and others.
+ * Copyright (c) 2013, 2014 EclipseSource and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
@@ -30,7 +30,7 @@
     application.addEntryPoint( "/dropdown", DropDownDemo.class, properties );
     application.addEntryPoint( "/autosuggest", AutoSuggestDemo.class, properties );
     application.addStyleSheet( RWT.DEFAULT_THEME_ID, "theme/theme.css" );
-    application.addThemableWidget( DropDown.class );
+    application.addThemeableWidget( DropDown.class );
   }
 
 }