Improved BzlSend::addAttachment and wrote basic test cases.
Moved composition logic to BzlMail\Composition\Facade. BzlSend simply delegates logic to this class.
Updated delegation in BzlSend. Added array support in Facade::addAttachment.
Updated BzlSend controller plugin.
Updated test file.
Updated tests.
Updated configuration options.
Cygwin commit.