Avis client library 1.0

Avis client library is a Java API for clients accessing Elvin event routers, including the open source Avis event router and the commercial Mantara Elvin product.
Avis is an event router service compatible with the commercial Elvin implementation developed by Mantara Software. Avis provides a fast, general-purpose publish/subscribe message bus.
Elvin event routers alllow arbitrary messages, known as notifications, to be exchanged via a publish/subscribe model. Elvin clients subscribe to messages published by other clients using expressions that match messages by their content.
The content-based routing approach used in Elvin routers differs from many other message bus systems that operate by selecting messages published on pre-defined channels, and has the advantage of promoting a much higher level of decoupling between producers and consumers of events.
The name "Avis" derives from the French word avis, meaning advice or notification.
Enhancements:
- This release marks a stable baseline for the Java client API.
- The core set of features required for an Elvin client library are now implemented and stable, including subscription, notification, security, close event notification, liveness checking, and router connection option support.