Todo: add unit test coverage for the following: - [SessionSimpleDbDomainCollection](https://github.com/rexm/SimpleDb.Net/blob/master/source/Cucumber.SimpleDb/Session/SessionSimpleDbDomainCollection.cs) - [SessionSimpleDbDomain](https://github.com/rexm/SimpleDb.Net/blob/master/source/Cucumber.SimpleDb/Session/SessionSimpleDbDomain.cs) - [SessionSimpleDbItem](https://github.com/rexm/SimpleDb.Net/blob/master/source/Cucumber.SimpleDb/Session/SessionSimpleDbItem.cs) - [SimpleDbSession](https://github.com/rexm/SimpleDb.Net/blob/master/source/Cucumber.SimpleDb/Session/SimpleDbSession.cs)
