Move auth calculation into refresh_token method#340

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joelugh wants to merge 3 commits intorequests:masterfrom

Commits on Dec 3, 2018

OAuth2Session request shouldn't require a client_secret for token refresh
Hugh Chan
committed
client_id is not a request level value. auth should be available through auto_refresh_kwargs
Hugh Chan
committed
None not needed for failed get
Hugh Chan
committed