fix activerel classname bug and travis

Fixes a dopey bug I introduced. This is why you write tests for everything. Also patches gemfile so Travis will run correctly, it was erroring out when it didn't specify the git repo. Is there a better solution to that?
You should not need this since we are using a released version of neo4j-core, 3.0.0.alpha.19.
We only need a :git parameter when we want to use the latest of neo4j-core
I also saw that there was a build failed on travis - but I think it was not because of this.