rippled: initial pkg and module expressions

rippled is the Ripple P2P payment network reference server
https://ripple.com
rippled: added comment on commented out config options
Merge branch 'rippled' of git://github.com/ehmry/nixpkgs

rippled: initial pkg and module expressions

Had to change the rippled uid.

Conflicts:
	nixos/modules/misc/ids.nix