Fix NuGet bug.
Fix NuGet bug.

The NuGet package dialog appears to be assuming transitive dependencies work here...and that's not the case. End result is build fail, see: https://ci.appveyor.com/project/StackExchange/opserver/build/1.0.480

opserver/Opserver,manesiotise/Opserver,opserver/Opserver,mqbk/Opserver,GABeech/Opserver,manesiotise/Opserver,GABeech/Opserver,opserver/Opserver,mqbk/Opserver,manesiotise/Opserver