add_user_to_org (and potentially all organisations functions) are missing a to_json

[gmauleon]

I think we miss a to_json when calling the post/put_request methods for the parameters as in:

return post_request(endpoint, user.to_json)

Thanks.
Gael

[hartfordfive]

@gmauleon I apologize for the delay in responding to this issue. I'll take a look at this and the other issues you've submitted over the next few days and get back to you.