Update copyPluginAssets to use prepared resources

Author: jpreynat

lib/output/website/copyPluginAssets.js

@@ -78,14 +78,16 @@ function copyAssets(output, plugin) {
 function copyResources(output, plugin) {
     var logger = output.getLogger();
 
-    var options = output.getOptions();
-    var prefix = options.get('prefix');
+    var options    = output.getOptions();
     var outputRoot = options.get('root');
 
-    var pluginRoot = plugin.getPath();
-    var resources = plugin.getResources(prefix);
+    var state = output.getState();
+    var resources = state.getResources();
+
+    var pluginRoot      = plugin.getPath();
+    var pluginResources = resources.get(plugin.getName());
 
-    var assetsFolder = resources.get('assets');
+    var assetsFolder = pluginResources.get('assets');
     var assetOutputFolder = path.join(outputRoot, 'gitbook', plugin.getNpmID());
 
     if (!assetsFolder) {