downvote_from does not work

[makenai]

The documentation in the readme cites downvote_from, but calling it results in an error. In votable.rb, I see upvote_from defined, but not downvote_from.

I guess either add the definition, or switch the docs to downvote_by.

[ryanto]

Thanks, this is now fixed. I think in a later version I am going to get rid of the mass aliasing (I'll have an option to use it if you want). I'm worried that this is now currently adding too many method onto the votable objects.