Fix bug in listen and unlisten multicast addressed using the DatagramSocket
Correctly handle HTTP CONNECT on the HttpClient.
Add support for modify the ownership of files and directories
Correctly notify exceptionHandler if a channel is closed during the websocket handshake.

See https://bugs.eclipse.org/bugs/show_bug.cgi?id=419726
Merge pull request #755 from eclipse/http_connect

Correctly handle HTTP CONNECT on the HttpClient.
Merge pull request #756 from eclipse/chown_filesystem

Add support for chown(..) operations to FileSystem.
Fix improperly named arguments in chownSync().
Merge pull request #760 from kuujo/chown-arguments

Fix improperly named arguments in chownSync().