Speed up repo chain setup by avoiding costly regexes
Speed up repo chain setup by avoiding costly regexes

Seems wasteful to assemble repo spec strings just to parse them again later on.
Better to create the repository objects directly and assemble the chain
manually.

MasterDuke17/rakudo,rakudo/rakudo,Gnouc/rakudo,salortiz/rakudo,tony-o/rakudo,MasterDuke17/rakudo,tony-o/rakudo,nbrown/rakudo,Gnouc/rakudo,salortiz/rakudo,tbrowder/rakudo,labster/rakudo,lucasbuchala/rakudo,softmoth/rakudo,Gnouc/rakudo,rakudo/rakudo,Gnouc/rakudo,labster/rakudo,nbrown/rakudo,salortiz/rakudo,MasterDuke17/rakudo,tony-o/rakudo,tbrowder/rakudo,tbrowder/rakudo,labster/rakudo,labster/rakudo,salortiz/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,softmoth/rakudo,tbrowder/rakudo,lucasbuchala/rakudo,labster/rakudo,nbrown/rakudo,softmoth/rakudo,salortiz/rakudo,Gnouc/rakudo,labster/rakudo,lucasbuchala/rakudo,softmoth/rakudo,rakudo/rakudo,Gnouc/rakudo,tony-o/rakudo,tony-o/rakudo,rakudo/rakudo,nbrown/rakudo,softmoth/rakudo,nbrown/rakudo,MasterDuke17/rakudo,tbrowder/rakudo,rakudo/rakudo,rakudo/rakudo,tony-o/rakudo,salortiz/rakudo,nbrown/rakudo,MasterDuke17/rakudo,lucasbuchala/rakudo,lucasbuchala/rakudo