Define Lime Brokerage specific MsgTypeValue

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Define MBTrading specific MsgTypeValue

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Define NASDAQ OMX specific MsgTypeValue

Signed-off-by: Jussi Virtanen <jussi.virtanen@valotrading.com>
Merge pull request #124 from jvirtanen/cleanups/message-types

Clean up message types