Add custom HTTP header to oauth requests

[obilodeau]

In follow up to bug #1120488 I'd also like to see the custom HTTP header in the oauth requests.

Currently only the "normal" API requests have the "X-Tomboy-Client" header, but I cannot identify oauth requests.

In grauphel, my owncloud note sync server, I'd like to display the client name (tomdroid in our case) that tries to get authentication. The header suffices, but isn't available in the oauth requests.

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Imported from Launchpad using lp2gh.

• date created: 2014-09-26T11:29:34Z
• owner: cweiske
• the launchpad url was https://bugs.launchpad.net/bugs/1374402