update leveldb link and fix some https links in README
update leveldb link and fix some https links in README

drhodes/cayley,h4ck3rm1k3/cayley,panamafrancis/cayley,zorojean/cayley,agupta666/cayley,sdaros/cayley,h4ck3rm1k3/cayley,abhishekgahlot/cayley,h4ck3rm1k3/cayley,sayden/cayley,cayleygraph/cayley,panamafrancis/cayley,drhodes/cayley,dtkav/cayley,posenhuang/cayley,Kavec/cayley,beni55/cayley,gmbuell/cayley,jacobxk/cayley,zorojean/cayley,tmlbl/cayley,ominux/cayley,samanalysis/cayley,skynet/cayley,abhishekgahlot/cayley,tmlbl/cayley,gmbuell/cayley,deskr/cayley,praisondani/cayley,kortschak/cayley,pombredanne/cayley,Kavec/cayley,jzelinskie/cayley,jzelinskie/cayley,pombredanne/cayley,jzelinskie/cayley,OrenBochman/cayley,sayden/cayley,gmbuell/cayley,Kavec/cayley,OrenBochman/cayley,karabijavad/cayley,panamafrancis/cayley,h4ck3rm1k3/cayley,beni55/cayley,sayden/cayley,dushmis/cayley,beni55/cayley,agupta666/cayley,LAlbertalli/cayley,barakmich/cayley,LAlbertalli/cayley,zorojean/cayley,samanalysis/cayley,HomeMango0310/cayley,barakmich/cayley,samanalysis/cayley,skynet/cayley,mjolk/cayley,deskr/cayley,pombredanne/cayley,dushmis/cayley,dtkav/cayley,skynet/cayley,googlearchive/cayley,hiteshjoshi/cayley,HomeMango0310/cayley,agupta666/cayley,kortschak/cayley,praisondani/cayley,zorojean/cayley,tmlbl/cayley,drhodes/cayley,1d4Nf6/cayley,HomeMango0310/cayley,dushmis/cayley,mjolk/cayley,1d4Nf6/cayley,azylman/cayley,hiteshjoshi/cayley,cayleygraph/cayley,kortschak/cayley,jzelinskie/cayley,OrenBochman/cayley,HomeMango0310/cayley,googlearchive/cayley,ominux/cayley,googlearchive/cayley,hiteshjoshi/cayley,barakmich/cayley,kortschak/cayley,praisondani/cayley,LAlbertalli/cayley,sdaros/cayley,ominux/cayley,posenhuang/cayley,deskr/cayley,posenhuang/cayley,barakmich/cayley,jacobxk/cayley,praisondani/cayley,karabijavad/cayley,kortschak/cayley,sdaros/cayley,karabijavad/cayley,jacobxk/cayley,pombredanne/cayley,tmlbl/cayley,azylman/cayley,abhishekgahlot/cayley,gmbuell/cayley,beni55/cayley,azylman/cayley,mjolk/cayley,agupta666/cayley,azylman/cayley,1d4Nf6/cayley,ominux/cayley,deskr/cayley,sdaros/cayley,sayden/cayley,1d4Nf6/cayley,skynet/cayley,hiteshjoshi/cayley,dushmis/cayley,Kavec/cayley,deskr/cayley,panamafrancis/cayley,dtkav/cayley,mjolk/cayley,samanalysis/cayley,LAlbertalli/cayley,posenhuang/cayley,dtkav/cayley,h4ck3rm1k3/cayley,abhishekgahlot/cayley,karabijavad/cayley,OrenBochman/cayley,drhodes/cayley,googlearchive/cayley,barakmich/cayley,jacobxk/cayley