Reduced object creation by caching the conversation response listeners.
388103 - Add API for tracking down upload progress.

Introduced Request.ContentListener, invoked after the content has been sent.
Made the test more reliable.
393473 - Add support for JSR-356 (javax.websocket) draft

 + Rounding out the Encoders / Decoders base implementation
Merge branch 'master' into javawebsocket-jsr