• Change default with context behavior to use .stop(force=True) on exit (is not fully backward compatible)
• Remove useless daemon_forward_servers = True hack for hangs prevention (is not fully backward compatible)
• Set transport keepalive to 5 second by default (disabled for version < 0.3.0)
• Set default transport timeout to 0.1
• Deprecate and remove block_on_close option
• Fix "deadlocks" / "tunneling hangs" (#173, #201, #162, #211)