420572 IOTest explicitly uses 127.0.0.1
420844 Connection:close on exceptional errors
[Bug 420930] Use Charset to specify character encoding

Signed-off-by: Mikhail Mazursky <mikhail.mazursky@gmail.com>
Connection and NetworkConnector now implements Closeable,
rather than AutoCloseable, since they deal with I/O.
Catching Throwable everywhere and closing channels when necessary to
avoid leaks.
allow for HttpConnection extensions
421197 - synchronize gzip output finish
Merge branch 'master' into release-9
set for release