Use Server in ConnectionSendTest

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Remove 'Connection#accept'

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Merge pull request #43 from jvirtanen/cleanups/connection-accept

Remove 'Connection#accept'