Updated OutputSettings inside of Document to be a static inner class.

This addresses the issue with using jsoup and scala 2.8 discussed here:
http://groups.google.com/group/jsoup/browse_thread/thread/3f7ec2fa41dfb87f

This change should be safe to commit and won't make a backwards incompatible
to the public interface of jsoup (you can always reference a static member
via a non-static path) for any existing users.  A recompilation of their code
won't even be necessary.

All tests continue to pass for me after this change.

src/main/java/org/jsoup/nodes/Document.java

@@ -203,7 +203,7 @@ public Document clone() {
     /**
      * A Document's output settings control the form of the text() and html() methods.
      */
-    public class OutputSettings implements Cloneable {
+    public static class OutputSettings implements Cloneable {
         private Entities.EscapeMode escapeMode = Entities.EscapeMode.base;
         private Charset charset = Charset.forName("UTF-8");
         private CharsetEncoder charsetEncoder = charset.newEncoder();