As an application author, I want to apply any necessary change scripts to 
the database by invoking DBDeploy from code, so that I can easily reset my 
database between tests.

Acceptance criteria:
* After invoking dbdeploy, any necessary scripts must have been actually 
applied to the database.
* I should not have to duplicate any dbdeploy code in order to invoke it 
from my application.

This may really be 2 stories?

Proposal:

Overload ToPrintSteamDeployer.doDeploy(), to allow injection of a 
ChangeScriptWriter, for which the application author can substitute an 
implementation that writes changes direct to the database.  DBDeploy should 
be the facade through which the application author injects the substitute 
ChangeScriptWriter.