Non https neo4j debian repo has old neo4j version

The `http` repo used here: https://github.com/tpires/neo4j/blob/master/Dockerfile#L12 doesn't contain the latest 3.x versions of neo4j community. Instead it tops out at 2.2.3.

By changing the repo to `https://` I was able to get the latest version of neo4j, but I had to also add the `apt-transport-https` package to get it to work.