https://issues.apache.org/jira/browse/TINKERPOP-2078
Basically replaces `EmptyGraph.instance().withRemote()` for
`ReferenceGraph.open().withRemote()` which is a bit more intuitive.
```text
gremlin> graph = ReferenceGraph.open()
==>referencegraph[reference]
gremlin> g = graph.traversal().withRemote('conf/remote-graph.properties')
==>graphtraversalsource[referencegraph[reference], standard]
gremlin> g.addV('person').property('name','stephen')
==>v[16]
gremlin> g.V().valueMap()
==>[name:[stephen]]
==>[name:[marko],age:[29]]
==>[name:[vadas],age:[27]]
==>[name:[lop],lang:[java]]
==>[name:[josh],age:[32]]
==>[name:[ripple],lang:[java]]
==>[name:[peter],age:[35]]
```
Builds with `mvn clean install && mvn verify -pl gremlin-server
-DskipIntegrationTests=false`
VOTE +1
[ Full content available at: https://github.com/apache/tinkerpop/pull/968 ]
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