Revision 275

This release contains a lot of updates to both the book itself and also to the sample programs. I focused on tidying up the text, fixing mistakes and also adding to several sections. I continued to add material to the Janus graph section in this iteration and also added additional text and examples to the main Gremlin discussion in sections 3,4 and 5. Please see the commit logs if you want more detailed information about what was improved. Starting with this release, I am now using asciidoctor-pdf to produce the PDF version. Previously I was just printing the HTML to PDF. I think the PDF looks nicer now and has page numbering.

Some new samples were added and some of the existing ones were improved in this iteration.

For 2018 I am going to try and publish at least one formal release each month if there is enough new material to justify making a release. To date releases have been quite regular as the project was ramping up. The Asciidoc file (Gremlin-Graph-Guide.adoc) will always represent the very latest updates.

Thanks to everyone who provided feedback either via issue, pull request or contacting me directly.