support for nexted flags
Use foldl1 for non-empty lists only
Merge pull request #10 from dmalikov/master

Thanks, sorry for mistake
point to own cabal fork
submodule update
submodule update
cabal submodule update
cabal submodule update
Warning-dirven Code-Maid
submoule update: forbid cabal to self update
cabal submodule update (rebase)