Error when passing geography objects to stored procs

Hi,
When trying to pass `SqlGeography` parameters to stored procs with Insight, it fails to create correct `SqlParameter` objects. The error reported is "Operand type clash: sql_variant is incompatible with geography".

I've created a failing test for this, but since there is a new NuGet package and a few scattered changes, I am sumbitting it as a pull request instead of an issue.