Add syntaxhighlighter.js for Pegdown

PegdownUtils.java

import org.pegdown.*;
import org.pegdown.ast.RootNode;
import org.pegdown.ast.VerbatimNode;

public class PegdownUtils {

    public static String asHtml(String source) {
        PegDownProcessor p = new PegDownProcessor(Extensions.ALL - Extensions.SMARTYPANTS);
        RootNode root = p.parseMarkdown(source.toCharArray());
        return new HighlightHtmlSerializer().toHtml(root);
    }

    static class HighlightHtmlSerializer extends ToHtmlSerializer {
        static final LinkRenderer INSTANCE = new LinkRenderer();

        public HighlightHtmlSerializer() {
            super(INSTANCE);
        }

        @Override
        public void visit(VerbatimNode node) {
            printer.println();
            printer.print("<script type=\"syntaxhighlighter\" class=\"brush: ");
            String lang = node.getType();
            printer.print((lang == null || lang.length() == 0) ? "text" : lang);
            printer.print("\"><![CDATA[\n").print(node.getText()).print("]]></script>");
        }
    }
}