[Haskell] ANNOUNCE: RandProc v0.4 released.

v0.4 of `RandProc` has just been posted to Hackage: http://hackage.haskell.org/package/randproc In this release: * Examples of using the `RandProc` library to work problems from `Random Processes` text have been added. * `README` file has been fleshed out a bit.