move some documentation in the README out, it is now in the github wiki
move some documentation in the README out, it is now in the github wiki

chriscondon/billtext,sunlightlabs/congress-opencongress,unitedstates/congress,boblannon/congress,Nolawee/congress,sunlightlabs/congress-opencongress,boblannon/congress,chriscondon/billtext,Nolawee/congress,unitedstates/congress