bug fix for ctran-annotate

I use ctran-annotate to annotate my Rails models. It's a nifty little gem that adds the database schema for a model to the top of your Model, spec/test, and fixture files. Unfortuately, it has a little pathing bug that keeps it working properly with rvm.

The fix is in a fork by James2M. Unfortunately, it too has a typo; just read the comment on that page.