Rename VersionedStore#redo to VersionedStore#rollforward

[clearwater-rb]

Rename VersionedStore#redo to VersionedStore#rollforward

[jgaskins]

I've thought about the naming divergence between the methods before, but never really put enough thought into it to come up with a better name scheme for it. 😄 I actually chose redo to align with the Rails db:migrate:redo Rake task (since the opposite direction is also rollback). I thought about going with undo / redo, but I'm not sure how I feel about it. Nobody else has really weighed in on it so I'm happy for any feedback you've got!

I'm glad you're trying out the gem, though! I find it a lot of fun to use and the immutable models force me to think about problems differently, rather than rushing in in my usual fashion. I usually use it to manage data structures in server-side persistent processes and client-side with Clearwater.