koa-passport breaks node-inspector (remove Proxy)
Thanks for the great module.

Kind of cool that it uses ES6 Proxy, but that's too early. Right now ES6 Proxy are non-debuggable, see the discussion here https://github.com/node-inspector/node-inspector/issues/413.

Koa-passport is usually quite close to the top of the execution stream. When node-inspector meets proxy, it dies, effectively making all the application code below undebuggable.

(That's actually a suggestion, I don't have a stack, but koa-passport is the only module which uses ES6 proxy in the project, and node-inspector dies with that Proxy `Illegal access` error).

Given that the ES6 Proxy debugging issue is not going to be fixed soon, could you please remove it from the code and replace with something more-or-less stable please?
