anchor.diff:  gremlin> :install com.tinkerpop neo4j-gremlin 3.0.0-SNAPSHOT
   ==>loaded: [com.tinkerpop, neo4j-gremlin, 3.0.0-SNAPSHOT]
   gremlin> :plugin use neo4j
  -==>...
   ==>neo4j activated
   gremlin> g = Neo4jGraph.open('/tmp/neo4j')
   ==>neo4jgraph[EmbeddedGraphDatabase [/tmp/neo4j]]
  
positive.code: ==>utilities[active]
  ==>neo4j
  gremlin> :plugin use neo4j <5>
  ==>...
  ==>neo4j activated
  gremlin> :plugin list <6>
  ==>server[active]
  
negative.code: ==>sugar
  ==>utilities[active]
  gremlin> :plugin use sugar  <2>
  ==>sugar activated
  gremlin> :install com.tinkerpop neo4j-gremlin x.y.z  <3>
  ==>loaded: [com.tinkerpop, neo4j-gremlin, x.y.z]
  