Updated allow html

[ZiNgA BuRgA]

Just search inc/class_parser.php for "<br" and you'll eventually find it.
An alternative is to just strip out newlines before the MyBB parser gets to it - that way, nothing gets replaced with <br> because there's no newlines.
Stopping the parser doing anything can be a bit tricky as the parser doesn't really understand 'exclusion zones' or the like.