valotrading/stirling — pull request #60 by akisaarinen (2012-09-27 12:09:32+00:00)
Title: Add base trait type for AddOrder and OrderExecuted

Because `AddOrder`/`AddOrderMPID` and `OrderExecuted`/`OrderExecutedWithPrice`
should often be handled similarly, add a base trait for these types to make the
handling easier.