Still changing rapidly--use at your own risk!
The config file rdf2neo.json has an example in the resources directory. You need a rdf2neo.json in your classpath to be able to run the app--just copy the example file and use it.
With sbt installed, just use sbt run after cloning the repo.
Some more description of our process:
http://slid.es/wfreeman/aug-2013-meetup