Added www-servers/mighttpd2 and its deps

Added these 6 packages.

* dev-haskell/control-monad-loop
* dev-haskell/process-conduit
* dev-haskell/static-hash
* dev-haskell/wai-app-file-cgi
* dev-haskell/wai-logger-prefork
* www-servers/mighttpd2