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added ability to pass down url query parameters to initial oauth2.0 authorization page #503
added ability pass down url query parameters to the initial oauth2.0 authorization page. e.g. this is useful for the Fitbit API which defines additional URI parameters (such as token expiration duration, ability to force authorization page/consent and others - see Authorization Page @ https://dev.fitbit.com/build/reference/web-api/oauth2/) that must be appended to the initial authorization URL.
I think the idea is sound. I've made a bunch of suggestions to improve the style.