This PR breaks the material concerning JanusGraph out from the Moving Beyond... chapter, into a chapter of its own. As part of the this rework the introductions to the Moving Beyond... and Introducing Gremlin Server chapters have also been updated so that the three chapters flow better as a journey from Gremlin Console and TinkerGraph, to programming in Java, to JanusGraph, and then to Gremlin Server. The improved flow will also help should we decide to add a chapter dedicated to the Gremlin GLVs. That chapter would naturally follow the Gremlin Server introduction.
This PR breaks the material concerning JanusGraph out from the Moving Beyond... chapter, into a chapter of its own. As part of the this rework the introductions to the Moving Beyond... and Introducing Gremlin Server chapters have also been updated so that the three chapters flow better as a journey from Gremlin Console and TinkerGraph, to programming in Java, to JanusGraph, and then to Gremlin Server. The improved flow will also help should we decide to add a chapter dedicated to the Gremlin GLVs. That chapter would naturally follow the Gremlin Server introduction.
Addresses issue #263