make sure webviewdemo isn't added to repo

.gitignore

@@ -9,6 +9,7 @@ sample-code/apps/TestApp/build
 sample-code/apps/WebViewApp/build
 *.sublime-*
 sample-code/apps/UICatalog*
+sample-code/apps/WebViewDemo*
 sample-code/examples/dotnet/SimpleTest/*.userprefs
 sample-code/examples/php/composer.lock
 sample-code/examples/php/composer.phar