Fix for Issue #33

[thisjustin]

This is a workaround to handle the fact that _boolean returns integers as strings that are supposed to represent boolean values

[BHSPitMonkey]

Thanks for this contribution! This is a great catch, however it looks to me like the root issue is that we shouldn't be using the _boolean function in these places where we're building a params object to pass as function parameters. (I think it's only supposed to be used when we're creating the payload objects for the actual HTTP request.)

I've gone ahead and made those changes in #46, so I'm going to close this one. Let us know if that works for you!