#466 restore class ToPDF

... which was deleted in commit 59969a2 because it was not used by FS itself.

But it appears that people do use `ToPDF` from command line to convert html to pdf.

flying-saucer-pdf/src/main/java/org/xhtmlrenderer/pdf/ToPDF.java

@@ -0,0 +1,55 @@
+/*
+ * {{{ header & license
+ * Copyright (c) 2006 Wisconsin Court System
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * }}}
+ */
+package org.xhtmlrenderer.pdf;
+
+import com.lowagie.text.DocumentException;
+
+import java.io.File;
+import java.io.IOException;
+import java.io.OutputStream;
+import java.nio.file.Paths;
+
+import static java.nio.file.Files.newOutputStream;
+
+public class ToPDF {
+    public static void main(String[] args) throws IOException, DocumentException {
+        if (args.length != 2) {
+            System.err.println("Usage: ... [url] [pdf]");
+            System.exit(1);
+        }
+        String url = args[0];
+        if (!url.contains("://")) {
+            // maybe it's a file
+            File f = new File(url);
+            if (f.exists()) {
+                url = f.toURI().toURL().toString();
+            }
+        }
+        createPDF(url, args[1]);
+    }
+
+    private static void createPDF(String url, String pdf) throws IOException, DocumentException {
+        try (OutputStream os = newOutputStream(Paths.get(pdf))) {
+            ITextRenderer renderer = ITextRenderer.fromUrl(url);
+            renderer.layout();
+            renderer.createPDF(os);
+        }
+    }
+}