* Returning a DefaultFullHttpResponse when response is non streaming.
* Removed unused import.
* Adding content-length header to empty full http responses
Merge branch 'RESTEASY-1090' of https://github.com/hypnopadge/Resteasy into RESTEASY-1090

Conflicts:
	jaxrs/server-adapters/resteasy-netty4/src/main/java/org/jboss/resteasy/plugins/server/netty/NettyHttpResponse.java