RFR JDK-8087113: Websocket API and implementation

[Pavel Rappo]

Hi,

Could you please review my change for JDK-8087113

   http://cr.openjdk.java.net/~prappo/8087113/webrev.03/

This webrev contains initial implementation and basic tests for WebSocket API.
Specification conformance & interoperability testing has been performed with
Autobahn Testsuite [1]. As for API tests, I will provide more of them later.

Thanks,
-Pavel

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[1] http://autobahn.ws/testsuite/