Neo4j 1.9.5

`brew` has updated Neo4j to 2.0.0, which we are not yet using. If you run a `brew upgrade` after a `brew update`, you'll get upgraded to 2.0.0 with the `neo4j` package.

After this merge, run `brew tap crunchbase/versions` and then `brew install neo4j19`. The binaries still are called `neo4j` and `neo4j-shell`, so this package conflicts with Homebrew's `neo4j` package, meaning don't install the plain `neo4j` package.

Any other configurations needed can be added at a later time to better mirror production.