pull request for AutoNewLines port form MarkDownSharp

[GoogleCodeExporter]

i cloned pagedown an ported the AutoNewLines option form MarkDownSharp to 
PageDown.

it could be usefull for other people as well, plz pull (and review) if you got 
the time.

http://code.google.com/r/marcdrexel-pagedown/

Original issue reported on code.google.com by [email protected] on 3 Aug 2012 at 11:38