haskell-wai-websockets: add version 2.1.0
haskell-leveldb-haskell: add version 0.3.0
Merge branch 'master' of git://github.com/hrdinka/nixpkgs

haskell-wai-websockets: add version 2.1.0

and

haskell-leveldb-haskell: add version 0.3.0