Support for transparent content decompression

Created http processor array like this
HttpProcessor httpproc = HttpProcessorBuilder.create()
.add(new RequestDefaultHeaders())
.add(new RequestAcceptEncoding())
.add(new RequestClientConnControl())
.add(new RequestContent())
.add(new ResponseContentEncoding())
.add(new RequestTargetHost()).build();

later http async client constructed as follows

CloseableHttpAsyncClient httpclient = HttpAsyncClients.custom()
.setConnectionManager(connManager)
.setHttpProcessor(httpproc)
.setUserAgent(hc.getUserAgent())
.setDefaultRequestConfig(defaultRequestConfig)
.build();

during invocation

Future<HttpResponse> future = httpclient .execute(httpget, null);
HttpResponse response = future.get();

entity.getContent() is not decompressed (gzip), however ResponseContentEncoding http processor was executed