Remove Fedora 18, 19 builds
Remove Fedora 18, 19 builds

http://hydra.nixos.org/build/17703462

ysangkok/nix,rycee/nix,vcunat/nix,tchajed/nix,gebner/nix,rycee/nix,bennofs/nix,peti/nix,shlevy/nix,garbas/nix,puffnfresh/nix,aucampia/nix,NixOS/nix,vizanto/nix,acowley/nix,bennofs/nix,wmertens/nix,zimbatm/nix,puffnfresh/nix,zimbatm/nix,layus/nix,dezgeg/nix,acowley/nix,peti/nix,gridaphobe/nix,ttuegel/nix,gebner/nix,peti/nix,ttuegel/nix,zimbatm/nix,bjornfor/nix,tchajed/nix,garbas/nix,layus/nix,vizanto/nix,aucampia/nix,pikajude/nix,rowhit/nix,wmertens/nix,dtzWill/nix,garbas/nix,gridaphobe/nix,ehmry/nix,shlevy/nix,dtzWill/nix,bjornfor/nix,puffnfresh/nix,aucampia/nix,ttuegel/nix,rycee/nix,wmertens/nix,rowhit/nix,vcunat/nix,peti/nix,garbas/nix,dezgeg/nix,acowley/nix,shlevy/nix,layus/nix,dtzWill/nix,ttuegel/nix,shlevy/nix,puffnfresh/nix,vcunat/nix,gebner/nix,vizanto/nix,peti/nix,offlinehacker/nix,joelmo/nix,ehmry/nix,bjornfor/nix,tchajed/nix,offlinehacker/nix,wmertens/nix,tchajed/nix,NixOS/nix,zimbatm/nix,aucampia/nix,dezgeg/nix,ehmry/nix,ysangkok/nix,bjornfor/nix,bennofs/nix,gridaphobe/nix,vcunat/nix,rycee/nix,offlinehacker/nix,ysangkok/nix,rowhit/nix,garbas/nix,dezgeg/nix,joelmo/nix,NixOS/nix,rycee/nix,ehmry/nix,layus/nix,acowley/nix,joelmo/nix,dtzWill/nix,dezgeg/nix,pikajude/nix,rowhit/nix,gebner/nix,dtzWill/nix,ehmry/nix,pikajude/nix,joelmo/nix,NixOS/nix,bennofs/nix,gridaphobe/nix,vizanto/nix,shlevy/nix,offlinehacker/nix,layus/nix,ehmry/nix,NixOS/nix