I released Gremlin-Scala 3.1.0 shortly after this. I just went through the projects in https://github.com/mpollmeier/gremlin-scala-examples and updated them as well. Looks like there is no 3.1.0 implementation for titan yet?
http://search.maven.org/#search|gav|1|g%3A%22com.thinkaurelius.titan%22%20AND%20a%3A%22titan-core%22
