Enable JWT for Box.com

[plesiv]

f444c3d box: add box.com OAuth endpoint

More info here.

32e393c Enable passing of additional Querystring params when requesting token

Some JWT Authentication APIs require the ability to pass additional
querystring parameters. For example Box.com API requires "client_id" and
"client_secret" parameters to be set (ref).

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[plesiv]

I signed it!

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[gopherbot]

This PR (HEAD: f444c3d) has been imported to Gerrit for code review.

Please visit https://go-review.googlesource.com/c/oauth2/+/185999 to see it.

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[gopherbot]

Message from Gobot Gobot:

Patch Set 1:

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[ncw]

This would be very useful for rclone as currently we implement our own JWT stuff for access to box.com. What is the status of this PR?

[gopherbot]

Message from Go Bot:

Patch Set 1:

Congratulations on opening your first change. Thank you for your contribution!

Next steps:
Within the next week or so, a maintainer will review your change and provide
feedback. See https://golang.org/doc/contribute.html#review for more info and
tips to get your patch through code review.

Most changes in the Go project go through a few rounds of revision. This can be
surprising to people new to the project. The careful, iterative review process
is our way of helping mentor contributors and ensuring that their contributions
have a lasting impact.

During May-July and Nov-Jan the Go project is in a code freeze, during which
little code gets reviewed or merged. If a reviewer responds with a comment like
R=go1.11, it means that this CL will be reviewed as part of the next development
cycle. See https://golang.org/s/release for more details.

---

Please don’t reply on this GitHub thread. Visit golang.org/cl/185999.
After addressing review feedback, remember to publish your drafts!