[#33571] Minify the html output

When gzip is enabled and debug is disabled, we can uglify the output. This only removes newlines between " > < ". It's not very aggressive on whitespace as that requires handling of css and javascript comments. But it reduces by a fair amount the size of the page. 
http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=33571