Fix wrong module usage on v2

[sigerello]

Hi,
You use param module from tricks package here to construct query string from object, but you also mistakenly use the same module to parse query string here, here and here instead of using queryparse package.
This leads to error Uncaught TypeError: str.replace is not a function when using with oauth-shim package and oauth_proxy option.

Here is the fix.

[MrSwitch]

Ahh thanks, i'm clearly missing some tests here. Thanks @sigerello you've really delved into the stack and nailed this PR.