Api refactor to allow calling various steps in the authentication process separately#8

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mich8bsp wants to merge 4 commits intobasespace:masterfrom

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Commits on Jul 14, 2020

refactor client creation to allow running each of the involved steps asynchronously
Michael Bespalov
committed
adding documentation to public API
Michael Bespalov
committed
single poll api - only device code is needed to check for access token
Michael Bespalov
committed

Commits on Jul 15, 2020

when user denied access, throw error instead of keeping waiting
Michael Bespalov
committed