ACTION-183 parameter for rules

Hi,

this now closes action-183, I added the text from Yves
http://lists.w3.org/Archives/Public/public-multilingualweb-lt/2012Jul/0226.html

to
http://www.w3.org/International/multilingualweb/lt/drafts/its20/its20.html#selection-global

I did not add it into a separate section since this is related only to
global rules.

Comments welcome,

Felix

-- 
Felix Sasaki
DFKI / W3C Fellow