fix pickling support for Settings objects
fix pickling support for Settings objects

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