add optional sort parameter to bill view, currently only  used for rss
add optional sort parameter to bill view, currently only  used for rss

mileswwatkins/billy,openstates/billy,loandy/billy,sunlightlabs/billy,openstates/billy,sunlightlabs/billy,openstates/billy,mileswwatkins/billy,mileswwatkins/billy,loandy/billy,loandy/billy,sunlightlabs/billy