Need to allow custom Client authentication

[cvillerm]

To allow custom OAuth2 Client authentication, it should be possible to pass client secrets as something else than a password. An example when using PingFederate as custom provider is the ability to use client-certificate-based authentication to authenticate the client with the token endpoint: https://documentation.pingidentity.com/pingfederate/pf81/index.shtml#concept_configuringClient.html

I am about to create a PR to support this, by allowing the clientSecret parameter to be passed as an object, contains options to be merged with the Wreck request options used when calling the token endpoint.

[cvillerm]

PR #286 submitted

[ldesplat]

Closed by c8781d9

[lock]

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