Add uri() to resolve #23
Use seeded Buffer() with mergeBuffers() to ensure appendable (resolves #24)
[#20,#26] Use Memoized Handler for send, always use timeouts for replies
[#27] Upgrade to Vert.x 2.1.5/Groovy 2.3.3
[#28] Update to 0.20.7
Adding reproducer integration test for issue with multi-threaded worker Verticles. See https://github.com/vert-x/mod-rxvertx/issues/20