Return correct node name for Recurly_NoteList

[drewish]

Notes weren't loaded after rewind() was called. The name didn't match what
was in the XML so __parseXmlToObject() was never called and hence the object
were never added to $this->_objects.

While I'm here I fixed a bug in the pager where it'd keep checking for a
next link so it could reload... that wasn't ever going to happen so it's
better to give a hard error.

Test this by trying to run the notes sample code in our docs:

try {
  $notes = Recurly_NoteList::get('b6f5783');
  foreach ($notes as $note) {
    print "Note: {$note->message}\n";
  }
} catch (Recurly_NotFoundError $e) {
  print "Invalid account code: $e";
}

[bhelx]

👍