The documentation is kind of confusing...is this to just look up names and get links to the docs? Does the full-text search actually search the documents?
I don't think the creator listed the site on the readme, but http://lukerosiak.info/irs/ is the site where this is running. It searches by Org and takes you to a copy of the original tax documents. It needs a lot of work for usability, but it is a powerful data source.