Getting set up with Cayley and Postgres (April 2018)
Initialize the database
$ createdb testdb
$ wget https://github.com/cayleygraph/cayley/releases/download/v0.7.2/cayley_0.7.2_darwin_amd64.tar.gz
$ tar zxvf cayley_0.7.2_darwin_amd64.tar.gz
$ cat >cayley.cfg.json
{
"store": {