Sem4r use a lightly modified version of Jekyll to had hard break.
The contents of the directory _post/ is copyright © Sem4r: Everything else is MIT Licensed.
Open file: jekyll-0.5.4/lib/jekyll/site.rb, change the ‘textile’ function to:
def textile(content) rc = RedCloth.new(content) rc.hard_breaks = false rc.to_html end