Add asciidoclet usage for javadoc and fix author tags in javadoc

See https://github.com/asciidoctor/asciidoclet for more information
Additionally this fixes building using jdk 1.8
Cleanup of junit tests

* Move duplicate code in shared abstract class
* Use static imports for junit asserts
* Move shared setup/teardown in abstract class
Add Neo4j HA cluster support to neo4vertx

* Cleanup configuration code
* Add Neo4jGraphDatabaseHAServiceFactory for HA support
* Add neo4j ha maven dependency
* Add documentation within readme
Merge pull request #2 from Jotschi/f-ha-support

HA Cluster support and various cleanup work.