Connect to graphene DB

Hello there,

When I try to connect to Graphene DB I get the following output : 

```log
14:40:14.646490 database.go:55: Status 200 trying to connect to http://app****:****@app***.sb02.stations.graphenedb.com:24783
panic: Invalid database.  Check URI.
```

I think GrapheneDB does not send the version back which is why it fails there.

Cheers.