Create Expectation Overloads for params

[JasonBock]

Similar to what I did for parameters with default values, it would be nice to have overloads where, instead of generating the parameter type as Argument<string[]> values, it would be params string[] values. Not sure if this would open a can of worms with ambiguous method overloads, but it's worth a try.

Now that I think about it, I think I do this if there are parameters with default values, so I may need to tweak this a bit.