Support OAuth1 client wreck options

[hueniverse]

Adds support for passing Wreck options to allow setting agent and other overrides.

[Nargonath]

Shouldn't we document that behavior in the options section of the API.md? Apart from that and my little comment, LGTM.

[hueniverse]

The client is not documents AFAICT which is why I didn't add that new option.

[devinivy]

This is published in 12.3.0. To clarify the previous comment, just want to note that this is not exposed publicly through the strategy since it is guarded by the strategy's validation: just through using the Client interface directly. I do think that it would be nice to sync these back up eventually by exposing it through the strategy with a test and docs.

[hueniverse]

Thanks!