add pickling support for Settings objects
add pickling support for Settings objects

pooya/disco,beni55/disco,pavlobaron/disco_playground,simudream/disco,pombredanne/disco,ErikDubbelboer/disco,pooya/disco,beni55/disco,oldmantaiter/disco,mwilliams3/disco,ErikDubbelboer/disco,discoproject/disco,ktkt2009/disco,discoproject/disco,ktkt2009/disco,seabirdzh/disco,pavlobaron/disco_playground,pavlobaron/disco_playground,seabirdzh/disco,seabirdzh/disco,ktkt2009/disco,scrapinghub/disco,pombredanne/disco,mozilla/disco,pombredanne/disco,jflatow/clx,oldmantaiter/disco,scrapinghub/disco,beni55/disco,pombredanne/disco,beni55/disco,ktkt2009/disco,seabirdzh/disco,discoproject/disco,mwilliams3/disco,pavlobaron/disco_playground,oldmantaiter/disco,pooya/disco,beni55/disco,mozilla/disco,mwilliams3/disco,seabirdzh/disco,mozilla/disco,simudream/disco,pooya/disco,pombredanne/disco,oldmantaiter/disco,scrapinghub/disco,ErikDubbelboer/disco,mwilliams3/disco,discoproject/disco,discoproject/disco,simudream/disco,ktkt2009/disco,simudream/disco,ErikDubbelboer/disco,mozilla/disco,simudream/disco,scrapinghub/disco,ErikDubbelboer/disco,oldmantaiter/disco,mwilliams3/disco