Implementation of "Async Support" for WebSocket transport and Long-Polling fallback to use on JBoss EAP 6.2 with JBoss Native Connector

Implementation of "Async Support" for WebSocket transport and
Long-Polling fallback to use on JBoss EAP 6.2 with JBoss Native
Connector.

This is a approach to solve fix issue
https://github.com/Atmosphere/atmosphere/issues/1670.

It's necessary configuring "init-param" for "AtmosphereServlet" in the
web.xml for use this async support:

<init-param>
<param-name>org.atmosphere.cpr.asyncSupport</param-name>

<param-value>org.atmosphere.container.JBossAsyncSupportWithWebSocket</param-value>
</init-param>
JBossAsyncSupportWithWebSocket autodetect

Change on DefaultAsyncSupportResolver for Atmosphere to autodetect
JBossAsyncSupportWithWebSocket