Tell Nuget that we are a commandline application so it doesn't use Weak ...

...Event Handling

http://msdn.microsoft.com/en-us/library/aa970850(v=vs.100).aspx which is not
currently implemented in mono.

basically here are the lines of code im trying to work around.
https://github.com/Haacked/NuGet/blob/ffdbd1430b47e66ef7341b4ddd8e4c8543afcea1/src/Core/Repositories/DataServicePackageRepository.cs#L65-L73

the else statement blows up on mono with NotImplementedException.